In a climate where anger and exhaustion over the still-unresolved issue of Brexit have left Britain divided like never before, the reception for Grant's efforts has been mixed.
Rather than campaigning for one particular party, he is instead calling for strategic voting to block the Conservative Party of Prime Minister Boris Johnson from winning a majority, backing the candidate in each race who he believes has the best chance to beat the Conservatives.
Grant is not the first celebrity to call for an end to Johnson's time in office, but he has been one of the most prominent — and possibly the busiest — in the weeks of canvassing before the election.
This week, he was campaigning alongside Dominic Grieve, a former Conservative lawmaker who refused to support Johnson's Brexit plans, was expelled from the party and is now running for his seat as an independent. In a campaign video for Grieve, Grant detailed his reasons for supporting him.
"I, for the first time in my life, am getting active politically, because I think that the country is on the edge of a true abyss," leaving the European Union without a trade agreement, he said. He described what he said would be "the catastrophe of a no-deal Brexit" under Johnson.
Speaking with voters Monday as he canvassed with Chuka Umunna, an incumbent Liberal Democrat, he offered the same message: That the only way to avoid a disastrous withdrawal from the bloc is to edge out Conservative candidates.
"I'm wandering around London and the suburbs, banging the drum about tactical voting, because I think in the absence of complete Remain alliance, that's our only hope as voters," he said.
Last week, Grant was canvassing with Luciana Berger, a lawmaker who joined the Liberal Democrats this year. She resigned from the Labour Party earlier after receiving anti-Semitic abuse.
This week, he was in Chingford, northeast of London, campaigning with Faiza Shaheen, a Labour candidate, at a subway station, where he handed out leaflets and spoke with voters.
While some have applauded his advocacy, others have criticized the actor for an approach that focuses only on one issue: Brexit. And some saw his decision to campaign with both Berger and Labour candidates as hypocritical, and heckled him as he canvassed with Shaheen.
He is also using his following of nearly half a million on Twitter to push for voters to lend their support to candidates calling for Britain to remain part of the European Union.
His brash approach on social media has drawn attention since August, when his expletive-laden Twitter post, bashing a controversial Brexit manoeuvre by Johnson, drew hundreds of thousands of reactions.
But Grant has also received a fair share of online abuse as a result of his activism. In response to the backlash he has received since he began canvassing, some of which made mention of a past arrest for soliciting a prostitute, Grant made the unusual decision to post his infamous 1995 mug shot on Twitter account on Thursday night.
"To my dear trolls," he wrote. "Hope this is helpful."
But he is not alone in using his platform as an advocate for candidates. Liam Gallagher, the former Oasis frontman, told British news outlets he would be voting for the Green Party to promote climate justice.
Rob Delaney, an US comedian, has been outspoken in his backing of the Labour Party and its support for the British National Health Service. In a campaign video, he detailed his experience with the health system, describing his young son's diagnosis and eventual death from a brain tumour, and said Labour's commitment to preserve the service was a reason to vote for the party.
British comedian Eddie Izzard, who has long been an outspoken Labour supporter, was again out canvassing for his party's candidates. Lily Allen, the British singer, and Stormzy, Britain's best-known grime artist, have also voiced support for Labour.
US actor Danny DeVito urged fans to vote Labour at a film premiere this year and made his support for the party clear while in London in 2017.
While the Conservatives certainly count celebrities among their fans, they have been less visible in this campaign. The party did not reply Friday to a request for information on celebrities campaigning alongside its candidates.
But the lack of a prominent celebrity endorsement doesn't seem to be affecting the party's popularity. Though recent polls have shown Labour narrowing the gap, the Conservatives have consistently held a wide lead.
Written by: Megan Specia
© 2019 THE NEW YORK TIMES