Hillary Clinton has replaced her campaign manager.
Democrats are hold nominating caucuses in Maine today following a weekend of sweeping wins for Barack Obama.
Senator Barack Obama swept the board in yesterday's Democratic primaries and caucuses, pummelling Hillary Clinton in three nominating contests, while Republican Mike Huckabee gave John McCain a run for his money.
Meanwhile Hillary Clinton announced she has replaced her campaign manager with a long-time aide. Maggie Williams, a top aide to Clinton when her husband Bill Clinton was US president, has taken over from Patti Solis Doyle as campaign manager.
Aides to Mrs Clinton played down any notion that the staff change was a signal of trouble for her campaign. Mrs Clinton did not spell out why Solis Doyle was being replaced.
The move comes after Mr Obama, who is locked in a battle with Mrs Clinton for the Democratic party's nomination, won big in Washington state, Nebraska and Louisiana, outscoring the former first lady by two to one.
Mr Obama swept Washington state and Nebraska with a staggering 68% of the vote. In Louisiana, with 98% of precincts reporting, he was on 57%.
'We won north, we won south, we won in between,' Mr Obama told 6,000 cheering guests in a speech to a Democratic dinner in Virginia.
Yesterday's results give the 46-year-old Illinois senator a high-voltage burst of energy ahead of the next nominating contests: on Tuesday in Virginia, Maryland and Washington DC and then Texas and Ohio on March 4.
And they will be a blow to New York Senator Clinton, who badly needs a win as the race moves to new battlegrounds after the Super Tuesday contests ended in a stalemate.
Senators Clinton and Obama are locked in a tussle for delegates to the party's convention in Denver in August, chasing the 2,025 delegates needed to win the party's nomination for November's presidential elections.
Thanks to the complex Democratic Party rules, it was not immediately clear how many delegates Mr Obama picked up from his victories on Saturday.
Later, Barack Obama beat Bill Clinton in a contest almost as closely watched as the primaries, the music industry's Grammy Awards.
Mr Obama won the spoken word Grammy for the audiobook version of his blockbuster tome 'The Audacity of Hope: Thoughts on Reclaiming the American Dream.' Bill Clinton was seeking his third Grammy with 'Giving: How Each of Us Can Change the World'.
Huckabee takes two states
On the Republican side, Mr Huckabee wrested two states from the apparent Republican front-runner McCain, in a huge boost to his flagging campaign.
He took Kansas by 60% and after a fierce battle in Louisiana, snatched the state with 44% to 42% for Mr McCain.
Mr McCain won Washington state by a narrow margin.
Mr McCain, 71, is virtually assured of the Republican party's nomination for the November elections, with some 724 delegates to 196 for Huckabee. A total of 1,191 are needed for the nomination.
But Mr Huckabee has been doing well in conservative, rural states.
US President George W Bush told conservative members of his Republican Party today that White House hopeful John McCain needed to do some work to win them over but he was a 'true conservative.'
'If John is the nominee, he has got some convincing to do to convince people that he is a solid conservative and I'll be glad to help him if he is the nominee,' Mr Bush said in a television interview with Fox News.
Mr Bush also took a direct shot at Democratic presidential candidate Barack Obama, questioning his foreign policy by pointing to the senator's support for direct talks with Iran's Mahmoud Ahmadinejad and potentially attacking Pakistan.
