"This has been a long campaign, and I will be making no decisions tonight," she said. Instead, the 60-year-old said she would spend the next few days determining "how to move forward with the best interests of our country and our party guiding my way."
US media reports quoted lawmakers as saying that during a conference call Clinton expressed willingness to serve as Obama's running mate in November if she was asked to.
The Obama campaign, however maintained that it was "too early" to discuss the issue. "We don't have a long list or a short list," said David Axelrod, Obama's chief strategist.
"Obviously she's an incredibly formidable person."
Obama supporters gathered in large numbers outside a convention centre in St Paul. Festive mood prevailed all over as Obama walked in with wife Michelle amid loud cheers in an arena draped with huge American flags and the trademark "Change We Can Believe In" banners.
Diving into general election mode, Obama took on presumptive Republican nominee John McCain, saying it's "time to turn the page on the policies of the past."
The 71-year-old Vietnam war veteran also did not mince his words while addressing a gathering in Louisiana, the home state of Indian-American Governor Bobby Jindal who has been apparently short-listed for Republican vice-presidential nominee.
"No matter who wins this election, the direction of this country is going to change dramatically. But the choice is between the right change and the wrong change, between going forward and going backward," McCain said.
Obama, however, said "It's not change when John McCain decided to stand with George Bush [Images] 95 per cent of the time, as he did in the Senate last year."
Image: Democratic presidential candidate US Senator Barack Obama and his wife Michelle wave to supporters during an election night rally at the Xcel Energy Center in St Paul, Minnesota, on Tuesday.
Also read: McCain launches sharp attack on Obama
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