Democratic and Republican presidential candidates have exchanged icy Iowa for the snows of New Hampshire as Barack Obama and Mike Huckabee hope to build on their sweeping victories in Iowa.
Mr Obama, who raced ahead of Democratic rivals John Edwards and Hillary Clinton to win a resounding victory in Iowa, is hoping that a second win in next Tuesday's New Hampshire primary will deliver a knockout blow to Ms Clinton.
"In four days, you can say we are choosing hope over fear . . . that change is coming to Washington and change is a coming to America," he said.
The former first lady, who came third in Iowa, is preparing to challenge Mr Obama on alleged inconsistencies in his record on issues like gun control and healthcare and she suggested that, as the new frontrunner, he needed closer scrutiny.
She said she would continue to contrast what she sees as her experience with Mr Obama's inexperience after just three years in the US Senate.
"We can't have false hopes. We've got to have a person who can walk into that Oval office on day one and start doing the hard work that it takes to deliver change," she said.
Leading candidates in each party will meet in back-to-back televised debates in New Hampshire this evening, which will afford Ms Clinton a chance to employ her new strategy against Mr Obama.
"It's hard to know exactly where he stands and people need to ask that. I think everybody is supposed to be vetted and tested," she said.
Mr Obama's sweeping victory in Iowa has transformed the Democratic race, demonstrating his potential to expand the party's base by attracting the support of Independents, young voters and Republicans. Two candidates, Delaware senator Joe Biden and Connecticut senator Chris Dodd, withdrew from the race after they attracted less than one per cent support in Iowa.
Mr Huckabee's win in the Iowa Republican caucus has dealt a severe blow to the hopes of former Massachusetts governor Mitt Romney, who is ahead in New Hampshire. Mr Huckabee has admitted he cannot win New Hampshire but John McCain is mounting a powerful challenge to Mr Romney. Mr Romney, who hugely outspent all his rivals in Iowa, suggested that Mr Huckabee owed his victory to the fact that he is an ordained Baptist minister.