But in the House, the Cook Political Report and other predictors have moved more than half a dozen seats in the Democratic direction in recent days, and Republican operatives are bracing themselves for an onslaught of Democratic money that they are calling "a green wave." Gubernatorial races - in which Democrats are trying to regain territory that they've lost in recent years, particularly in the Midwest - are also trending left.
"There's nothing quite like a good old-fashioned Supreme Court fight to polarize the electorate - and that's what we've observed in the past few weeks," said David Wasserman, House editor of the nonpartisan Cook Political Report. "The Kavanaugh issue has almost acted as a centrifuge to separate red and blue elements of the electorate even more."
The Supreme Court battle has washed over the campaign in a way that no single issue has before, drowning out topics Democrats want to talk about (health care) or the ones Republicans are pushing (tax cuts and a rosy economy). In a season defined by enough-is-enough female energy - along with white male rage and aggrievement that is stomping back to 2016 levels - the Kavanaugh confirmation hearings were explosive on all fronts.
In recent days, Trump has fiercely defended Kavanaugh and mocked his accusers, candidates have aired new ads on their positions, debates have pivoted on the nomination, and both parties have sensed political advantage in what already had stacked up as an election dependent on each side motivating its base.
The divide into separate camps has been on vivid display among protesters inside the U.S. Capitol - but it is also playing out more subtly in the rest of the country, from retail store parking lots in Fargo, North Dakota, to the bars of Bedminster, New Jersey.
Democrats have always faced a difficult Senate map - six of the competitive seats that they hold are in states Trump won, and five of those states he carried by at least 19 points - but their path now is more treacherous.
In North Dakota, television screens across the state were flashing with ads both attacking Heitkamp and defending her record. At Fargo's VFW Post 762, drinkers pulled their eyes away from the nightly happy hour drink raffle to watch back-to-back political spots.
Just hours before Heitkamp announced her opposition to Kavanaugh, voters like Stephanie Beyah were still weighing their support for the incumbent based on what the senator might do.
"I think it would be awful [to have Kavanaugh on the Supreme Court]," Beyah, a young woman in her 30s, said as she pushed a cart of purchases through a Target parking lot. "Just beyond the allegations, the way he portrayed himself last week was terrible. This is not a spot on the school board. You're choosing a guy that will change people's lives."
Troy Reich, a burly man in a flannel shirt juggling a stack of boxes as he entered the U.S. Post Office in downtown Fargo, said he was a firm supporter of Heitkamp's opponent, Republican nominee Rep. Kevin Cramer, R-N.D. But the Kavanaugh hearings increased his anger at Democrats, and he feels the drama will affect tight races like the Senate contest.
"It was a total witch hunt," Reich said. "I think it was ridiculous, and now they still haven't proven anything. It was totally partisan, and I think it's going to come back around on them."
In Indiana, where Democratic Sen. Joe Donnelly is fighting for re-election in a state Trump won by 19 points, the Kavanaugh dispute has riled up conservative male voters who feel he is a victim of partisan smears and unfounded accusations about what amounts to schoolboy antics, said Brian Howey, the author of a website on Indiana politics.
"The allegations of Dr. Ford, they just threw a pipe bomb in this race," Howey said. "Now we're waiting to see who the shrapnel takes out."
Recent polls show a dead heat between Donnelly, who announced his opposition to Kavanaugh last week, and his Republican opponent Mike Braun.
Tim Chapman, the executive director of Heritage Action for America, a conservative political organization, said the Kavanaugh hearing was a "game changer" for red state Democrats like Donnelly.
"He is in a really tough spot," Chapman said. "He is going to vote against Kavanaugh, so for us, that becomes a real issue that we can drive from now until November and remind people that he was on that side."
Kate Oehl, Donnelly's press secretary, said the senator will spend the next month focused on health care, which his campaign believes is a more salient issue for voters.
For Republicans, a major challenge will be keeping their base riled up over how Kavanaugh was treated, even though he was poised to win in the end. Democrats believe that the enthusiasm advantage will shift back their way.
"On our side, the outrage will live for years," said Brian Fallon, a Democratic consultant. "And it'll be very pronounced, particularly among women voters who are already the backbone of the resistance. . . . It'll be year of the women redux."
Democrats believe the Kavanaugh hearings could help them in Nevada - where Rep. Jacky Rosen is running against Republican Sen. Dean Heller for his seat - and in Arizona, where Democratic Rep. Kyrsten Sinema and Republican Rep. Martha McSally are in a tight race to success Republican Sen. Jeff Flake, who opted not to run again.
The dynamics in the House races are completely different because of their political terrain. Of the 68 House races viewed as competitive by the Cook Political Report, only 16 are in states that have a competitive Senate race.
"That's unheard of," Wasserman said. "We just have this huge divergence between the partisanship of the most competitive Senate seats and House seats."
Democrats are feeling confident about winning a net of 23 seats needed to control the House. Already, Republicans are pulling money from several districts they had initially hoped could be within their grasp.
Republicans are suffering particular problems among highly educated voters who live outside urban centers like Kansas City, Philadelphia and Denver.
The National Republican Congressional Committee pulled about $1 million in planned spending from the 3rd Congressional District in Kansas, where Rep. Kevin Yoder is running for re-election. Outside groups have also been pulling ads from districts held by Rep. Barbara Comstock, R-Va., and Rep. Mike Coffman, R-Colo., an indication that they no longer see those races as competitive.
"If the Democratic base gets any more excited they may have to seek medical attention," said Corry Bliss, who runs the Congressional Leadership Fund, which is aligned with House Speaker Paul Ryan of Wisconsin to preserve the House GOP majority. "In the last week things have undeniably improved in our polling. Republican intensity and excitement are through the roof. Now we need to keep the trend going for the next few weeks."
The countervailing forces could be seen in the suburbs outside of Newark, where Republican Leonard Lance is seeking his sixth term in a district that Hillary Clinton carried in 2016.
"It's been a re-energizer, frankly," Janice McLean, 58, said during a Democratic-led protest in New Jersey.
"Republican women are motivated," said Marlene Sincaglia, a retired middle school French teacher, a few hours later and a few miles away.
Lance's opponent, Democrat Tom Malinowski, a former assistant secretary of state under President Barack Obama, released an ad on Sept. 26 featuring a soundbite of Lance seeming to question Ford's allegations that Kavanaugh had assaulted her.
"I think Judge Kavanaugh is a brilliant judge and I tend not to believe the charges," Lance is heard saying on the clip.
Lance told The Post he found Ford's testimony to be credible - as well as Kavanaugh's - and noted that he was among the Republicans who called for an FBI investigation.
Protesters, who have often come to his district office to protest Trump, are now focused on Kavanaugh.
In Westfield, New Jersey, days ago, a 2-year-old girl on her father's shoulders held a message scrawled on the back of a Pampers box: "Believe Women." A 61-year-old artist waved a fluorescent pink sign that said "Hell No Kava-No" in her left hand and a tambourine in her right. Another woman who said her college-age daughter had been raped her freshman year propped up a banner that read "I Believe Dr. Christine Blasey Ford!"
Across the district in Berkeley Heights, Lance mingled with constituents nibbling on crudites at a reception before kicking off a Boy Scouts awards dinner. Some of the Republican voters there were fired up - in support of Kavanaugh.
"I look at this and I fear for my 20-year-old son," said Jeanne Kingsley, a Berkeley Heights councilwoman who is a Republican and mother of two sons and two daughters. "I called him and said, 'Do not be alone with a woman. We're in an environment now where someone can say anything they want and not have to back it up.'"
Margaret Illis, another woman at the event, has two sons and two daughters spanning ages 17 to 24. It is her daughters she fears for.
"I don't know a single woman in my generation who wasn't in some way sexually assaulted, whether it was being felt up on the train in New York City or by a boss at a fast food restaurant when you were 16 or a coworker who continually got too close in the elevator," said Illis, 59-year-old former designer and analyst for a software development firm. "I really thought the world had changed. And now I'm opening my eyes to the fact that it hasn't."
Illis, a recently registered Democrat who considers herself an independent, said she has voted for Lance a number of times in the past. She now plans to vote for Malinowski because "I want my daughters to have a better future."
"After the Kavanaugh hearings, people are resolved to do more to try to flip the House," said Illis, who attends house parties where activists send handwritten notes to infrequent voters encouraging them to vote by mail and reminding them of what's at stake.
"I'm passionate now," she said, "about changing my representative in Congress."
