Democratic U.S. presidential candidate Bernie Sanders smiles as he waves to the crowd at his 2016 New Hampshire presidential primary victory rally in Concord, New Hampshire February 9, 2016. REUTERS/Shannon Stapleton

It is a measure of the radical mood of America that virtually every presidential candidate who has so far come to the fore present themselves as an op(...)

Republican presidential candidate Ted Cruz campaigns at High Point Bulls Oswald Barn in Osceola, Iowa on Tuesday. Photograph: Jim lo Scalzo/EPA

Ted Cruz came to a cold hay barn on a farm in a remote part of a snowy Iowa to make his case to conservatives and evangelicals in a final push to win (...)

Two anti-abortion activists behind the filming of videos on foetal tissue procurement by Planned Parenthood have been indicted by a Texas grand jury that the women’s health group of any wrongdoing. Photograph: Andrew Burton/Getty Images

A grand jury in the United States that was investigating accusations of misconduct against Planned Parenthood has instead indicted two abortion oppone(...)

Presidential candidate Donald Trump, Senator Marco Rubio and Ben Carson during the Republican Presidential Debate in Milwaukee, Wisconsin. Photograph: Scott Olson/Getty Images

Donald Trump clashed with rivals, former Florida governor Jeb Bush and Ohio governor John Kasich in the Republican Party’s fourth presidential debate (...)

Wisconsin Governor Scott Walker announced on Monday that he was suspending his bid for the Republican presidential nomination. Photograph: Ben Brewer/The New York Times.

Republican Governor Scott Walker of Wisconsin abruptly pulled out of the 2016 US presidential race on Monday, doomed by a lightning-quick collapse (...)

US border patrol agents detaining undocumented immigrants  after they crossed the border from Mexico into Texas. Photograph: John Moore/Getty Images

“Anyone truly interested in US-Mexican border issues needs to stay for more than an afternoon,” says Judith Zafferini, a Democratic state senator for (...)

US  presidential candidate Donald Trump at Manhattan Supreme Court in New York on Monday, where he appeared for jurty duty. Trump’s  hard line on immigration has driven rivals to match his biting anti-immigrant language. Photograph: Lucas Jackson/Reuters

Republicans thought they had learned a lesson after 2012: Turning off Latino voters ensures defeat in the general election. But as the disruptive US p(...)

US presidential candidate  and businessman Donald Trump. Photograph: Brian Snyder/Reuters

Embattled Republican presidential candidate Donald Trump has hit back at critics who say he went too far with caustic comments about a US television n(...)

Seventeen Republicans, led by outspoken billionaire Donald Trump, are seeking the party’s presidential nomination. Photograph: Frederic J Brown/AFP/Getty Images

The head of the Republican Party has said its presidential candidates are unlikely to attack each other in the party’s first official debate but inste(...)

Ahead of the first US Republican TV debate on Fox, Donald Trump sits atop the polling average - and has in fact widened his lead - with Jeb Bush and Scott Walker behind him. Photograph:  Frederic  J. Brown/AFP/Getty Images.

For the last several weeks, the likely slate of US Republican candidates for the first televised debate this week has shifted constantly at the cut(...)