WASHINGTON - The clock is ticking, and both candidates know exactly what's at stake in what could be a defining day for Democrats.
Does Clinton need to win both Texas and Ohio? Watch Quin Hillyer with The Examiner for more, following this report.
Voters in four states - Ohio, Texas, Rhode Island and Vermont - head to the polls with nearly 450 delegates up for grabs.
Clinton Goes on the Attack
And Senator Hillary Clinton - who trails Senator Barack Obama in the delegate count after 11-straight losses - is on the attack, playing up her experience to solve the country's pressing issues.
"Those of us who are well off, those of us who have health care, those of us who have our education, those us who don't think we have to worry to much about the future it's time we looked around and saw what's going on in the rest of Ohio. and the rest of America."
Both Clinton and Obama spent the weekend stumping for votes, at one point campaigning at rival high schools in the same city.
But the former first lady also took time to lighten up with a guest appearance on "Saturday Night Live."
Moving in for the Kill
Riding on a wave of momentum, Obama is going for the jugular hoping to win Tuesday's primaries with his message of change.
He insisted that the country needed, "a politics that is based not on tearing each other down but building America up. Senator Clinton, that is why we are winning."
Polls show Obama has chipped away at Clinton's double-digit leads from just weeks ago. They're now neck and neck in Texas and Ohio.
While aides privately say they feel Obama has a good shot at winning Texas, they're not so sure about Ohio, where this weekend Obama told a crowd that he's a devout Christian and prays to Jesus every night to counter claims that he's a closet Muslim.
If Obama has another strong showing on Tuesday, some Democrats like New Mexico's Gov. Bill Richardson say the Clinton campaign should consider bowing out to unify the party.
"I just think that D-Day is Tuesday. We have to have a positive campaign after Tuesday. Whoever has the most delegates after Tuesday, a clear lead, should be, in my judgment, the nominee," Richardson told CBS's Face the Nation.
But Clinton officials have suggested that if Obama doesn't win all four contests, Clinton could continue until the next major primary in Pennsylvania on April 22.