Yessir, I was wrong. It's reasonable to consider Trump the favourite to win the Republican nomination for US President, writes Jack Tame.

COMMENT: The barbarian is no longer at the gate. He's inside the castle and heading for the throne room, writes Paul Thomas.

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.

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.

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

"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.

Much fun has been had at the expense of the US Republican Party candidates for the presidential nomination over the fact they're all bonkers.

The fallout from the Iowa contest in the United States presidential race was swift.

Mark Triffitt asks, how can a political and policy freak show like Donald Trump become a serious contender for the job America touts as "leader of the free world"?

It's a given that plenty of politicians play fast and loose with the truth, especially on the campaign trail, writes Paul Thomas. Trump isn't hyping his policies or exaggerating his opponents' shortcomings, he's slandering an entire community.

I certainly share the goal of never having to bail out the big banks again, but I prefer the path of tackling the most dangerous risks in a different way, writes Hillary Clinton.

He is really rich. That, according to Donald Trump, is one of the primary reasons people should vote for him.

Obama's possible successor picks up the challenge of US love-affair with weapons.

Jeb Bush is entering a critical phase of his Republican presidential campaign, with top donors warning that the former Florida Governor needs to demonstrate growth.

The American political parties are urging wealthy backers to give them 10 times more money than was allowed in the last presidential election.

No one expects 'The Donald' to be President, but his rivals might be better to go for him now before he spoils his party's chances.

American voters' craving for authenticity in political leaders is aiding hopefuls such as Ben Carson and Bernie Sanders.

Why is Donald Trump holding a commanding poll lead over his rivals for the Republican presidential nomination? Paul Thomas has some possible answers.

The celebrity billionaire struggles to turn his political fling into a durable campaign.

How long can the Republicans treat Donald Trump as a sideshow before they and the party they seek to lead suffer the political effects of his excesses?

From the first moment of yesterday's Republican presidential debate, Donald Trump showed that he won't be playing by anybody's rules but his own.