COMMENT: The Left and Right are agreed that Trump would demean the world's most prestigious political office.

Remaining four GOP candidates put to the test in high-stakes Florida debate.

Moral dilemmas often pit narrow self-interest against the greater good, writes Paul Thomas.

Democratic presidential hopefuls Hillary Clinton and Bernie Sanders sparred over who was more committed to immigration reform at a presidential debate.

You want to be mayor? Get a wall.

A retired three-star general has spoken out that the armed forces would not be Trump's "palace guards" if he became president.

Could an old bet about Donald Trump prove lucrative for Polly Gillespie?

Donald Trump is responding to Mitt Romney's evisceration of him by noting that that the 2012 GOP presidential nominee begged for Trump's endorsement.

Trump has put KKK back in spotlight but group has been trying to influence elections for a long time.

COMMENT: Every day it is less surprising that Trump does best in the areas of the country with the most racist Google searches.

By the time you sit down to eat your turkey this Christmas, Boris Johnson and Donald Trump could lead the English-speaking world, writes Peter Foster.

Republican presidential candidate Marco Rubio has received boosts in his drive to become the mainstream Republican alternative to Donald Trump.

Jeb Bush's failure demonstrated money is not everything, and that, this time, solid, innovative policy is not a ticket to the nomination.

Hillary Clinton badly needed to win the Nevada caucuses. And she won them.

After months of jabbing at each other, Cruz and Rubio shape up for knockout fight.

NBC and the Wall Street Journal casually tossed a bombshell into the political world with a poll showing Ted Cruz with a slight lead in Republican polling.

South Carolina and Nevada are but a few days away. I have never been so immersed in the American presidential race, writes Mike Hosking.

"I continue to have faith in the American people. And I think they realise that being president of the United States is a serious job. It’s not hosting a talk show," Obama said at a news conference in Rancho Mirage, California.

The unexpected death of Justice Antonin Scalia has left it deeply divided along ideological lines, much as the US is, writes Karen Tumulty.

Sanders beat up Hillary Clinton rather badly, but Clinton still walked away with more delegates to take to the Democratic national convention, writes Larry Williams. Tell me that's not a little dodgy.

The meaning of the New Hampshire primary is that Americans are in open revolt against the system, fear of the future and rage against economic inequality.

Senator Sanders' age and relative obscurity would in any case count against him, but the real disqualification, it is believed, is that he is a self-declared socialist, writes Bryan Gould.