New York could also inject a new momentum behind the leader in the Republican race, businessman Donald Trump, in his bid to be the party’s nominee. He has 744 delegates to 559 for Texas senator Ted Cruz. Photograph: Christopher Lee/The New York Times

The second-biggest prize in the Democratic presidential election – and the fourth-biggest in the Republican race – will be up for grabs when primary v(...)

Young Bernie Sanders supporters hold Bernie posters before the campaign rally at Washington Square Park in New York on Wednesday night.  Photograph: Peter Foley/EPA

Thousands of Bernie Sanders’s supporters descended on Washington Square Park in Manhattan on Wednesday evening, bringing even more colour and energy t(...)

Republican presidential candidate Donald Trump speaks to guests during a campaign rally at the Radisson Paper Valley Hotel in Appleton, Wisconsin. The state’s  voters go to the polls for the Republican  primary on Tuesday. Photograph: Scott Olson/Getty Images

This week was the first since the inaugural qualifying round of the US presidential election in Iowa on February 1st that there hasn’t been primary or(...)

Donald Trump exits the stage after speaking during a Super Tuesday night event in Palm Beach, Florida. Photograph: Luke Sharrett/Bloomberg

The biggest day of the US presidential battle led to the victories for Donald Trump and Hillary Clinton but four state wins for Bernie Sanders, three (...)

Republican US presidential candidate Donald Trump (L)  and Democratic US presidential candidate Hillary Clinton (R) rolled up a series of wins on Tuesday. Photograh: Scott Audette/ Javier Galeano/Reuters

Donald Trump and Hillary Clinton scored major wins on the biggest night of the US presidential election so far, extending their leads in the races to (...)

A man looks on as he waits for Republican US presidential candidate Donald Trump to speak at a campaign rally on Super Tuesday in Columbus, Ohio March 1st. Photograph: Aaron Josefczyk/Reuters

Voters in 12 US states go to the polls on Tuesday as Donald Trump and Hillary Clinton, who have had the most success in the early nominating contests,(...)

Democratic presidential candidate former secretary of state Hillary Clinton greets supporters during a ‘Get Out The Vote’ event at Lake Taylor Senior High School on Sunday in Norfolk, Virginia, ahead of Super Tuesday. Photograph: Getty

Voting has begun in the so-called Super Tuesday primaries in which candidates vying to secure their party’s nomination for the November US presidentia(...)

US Republican presidential candidate Donald Trump: polls put the party frontrunner ahead in Alabama and Oklahoma. Photograph: Reuters

Billionaire Donald Trump has been heavily criticised for refusing to repudiate an endorsement from racist group the Ku Klux Klan. The 2012 Republica(...)

Hillary Clinton:  “firewall” of southern minority voters held strong against Bernie Sanders. Photograph: Gerald Herbert/AP Photo

After two narrow wins and one heavy defeat in the early nominating states, Hillary Clinton banked her first landslide victory, in South Carolina’s pr(...)

From left: Senator Marco Rubio, Donald Trump and Senator Ted Cruz during the Republican presidential primary debate in Houston. Photograph: Eric Thayer/The New York Times

The mocking and insulting spilled into another day as Republican presidential frontrunner Donald Trump sought to rebound from a bruising debate on Thu(...)