Extreme sports personality Dean Potter and his dog Whisper in an undated handout photograph. Tributes have been paid to Potter after his death in a Base jumping accident over the weekend. Photograph:  EPA/Adidas AG

Dean Potter was an artist and a visionary, friends and contemporaries said today, following the death of the extreme climber in a Base jumping acciden(...)

Martin O’Malley, who is expected to announce his candidacy for US president shortly. Photograph: Tom Williams/Roll Call via Getty Images

Martin O’Malley, a likely contender to be the Democratic Party’s presidential candidate, is due in Dublin on May 24th after cancelling a trip last mon(...)

Potential Democratic presidential nominee Hillary Clinton  at Columbia University in New York. Ms Clinton has  voiced her support for immigration reform in the US during a fundraising function. Photograph: Brendan McDermid/Reuters

America’s immigration problem needs to be addressed, in a way that helps families, potential Democratic presidential nominee Hillary Clinton has sa(...)

Possible presidential candidate Martin O’Malley: the presidency is “not some crown to be passed between two families”. Photograph: Win McNamee/Getty Images

The message from Democrats in South Carolina, delivered with that soft southern twang, is this: assume victory here at your peril.It’s 19 months out f(...)

Senator Elizabeth Warren: ‘No more secret deals. No more special deals for multinational corporations.’ Photograph: Yuri Gripas/Reuters

Powers that would allows US president Barack Obama to agree trade deals with Asian countries and the European Union, as well as the deals themselve(...)

Hillary Clinton meets and greets supporters after a discussion at Whitney Brothers in Keene, New Hampshire, on Monday. New Hampshire will be the first to hold a presidential primary. Photograph: The New York Times

The event is beautifully staged: the owner of the business and six employees sit around as Hillary Rodham Clinton fields questions and shares her view(...)

In 2008, Hillary Clinton took advice from two men – Bill Clinton and Mark Penn – and campaigned like a man. Now she must figure out how to campaign as a woman. Photograph: Brendan McDermid/Reuters

The most famous woman on the planet has a confounding problem. She can’t figure out how to campaign as a woman.In 2008, Hillary Clinton took advice fr(...)

Nicholas Slatten (left), a former Army sniper from Tennessee, was sentenced to life in prison; Dustin Heard, also of Tennessee and  Evan Liberty of New Hampshire were both sentenced to  30 years. Photograph: Reuters

One former Blackwater security contractor received a life sentence on Monday and three others received 30-year sentences for killing unarmed Iraqi ci(...)

A Lamborghini that was part of an exotic car racing attraction at Walt Disney World crashed into a guardrail, killing a passenger and injuring the driver, police said. Photograph: WFTV via AP

A Lamborghini that was part of an exotic car racing attraction at Walt Disney World crashed, killing a passenger and injuring the driver.The Florida H(...)

In the 2016 race, Clinton will put women and children first, casting herself as a champion for low wage earners - both themes central to her campaign launch video. Photograph: AFP/Getty Images. 0:52

The finest moment in Hillary Clinton’s political life – so far – arrived on a hot June day in 2008, when she finally took ownership of her place in(...)