Clinton reacted to news of the endorsement by saying she has a lot of regard for Kerry.
"That's his decision to make. I'm very proud to have the support that I have," she said while campaigning in Nevada.
Kerry should be able to provide some organizational and fundraising muscle to Obama.
Since losing the 2004 race, Kerry has kept a national network of supporters intact.
He has an e-mail network of 3 million supporters, according to aides. Kerry also has traveled extensively raising millions of dollars for other Democratic candidates nationwide.
The Republican National Committee was dismissive about Thursday's endorsement, branding Kerry and Obama "liberal soul mates."
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