DAY IN A NUTSHELL
Mitt Romney endorses his former rival for the Republican nomination, John McCain. Hillary Clinton is declared the winner of New Mexico's Super Tuesday caucus, winning one extra delegate. She takes her campaign to Ohio, which - like Texas - holds its primary on 4 March. Barack Obama receives an endorsement from former Rhode Island Senator Lincoln Chafee, who was a Republican until 2007, when he left to become an independent.
KEY QUOTES
"Happy Valentine's Day - I apologize to all of you who are not spending Valentine's Day with your significant others."
Hillary Clinton greets journalists on her campaign plane
"Heavy with class warfare, it is a speech that could have been delivered by a Democrat in 1968, or even 1928"
"Over the past several days, Barack Obama and John McCain have been going at each other as if they'd already been crowned."
John Dickerson, Slate.com
"Even when the contest was close and our disagreements were debated, the calibre of the man was apparent. This is a man capable of leading our country at a dangerous hour."
Former Republican candidate Mitt Romney endorses John McCain.
"Unhinge yourself from the mesmerizing voice. What one hears is a message that is largely negative, illustrated with anecdotes of unremitting bleakness. Heavy with class warfare, it is a speech that could have been delivered by a Democrat in 1968, or even 1928."
The Wall street Journal's Daniel Henninger examines Barack Obama's speeches
NUMBER NEWS
Hillary Clinton's strategy of relying on wins in the bigger states holding contests in March and April received a boost today, as two Quinnipiac polls published today suggest she has big leads in Ohio and Pennsylvania.
The Ohio poll has her on 55%, 21 points ahead of Barack Obama on 34%.
In Pennsylvania, Quinnipiac suggests she has 52%, to Mr Obama's 36%.
The pollsters also sought to discover whether Mrs Clinton or Mr Obama would fare better against John McCain in a general election.
In Ohio, polls indicate that Mr McCain would beat both Democrats; Mrs Clinton by 44% to 43% and Mr Obama by 42% to 40%.
And in Pennsylvania, polls suggest that both Democrats could beat Mr McCain; Mr Obama by 42% to 41%, and Mrs Clinton by a larger margin - 46% to 40%.
DAILY PICTURE
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