Stars Work the Phones for Barack Obama

Rocking an Obama pin and a "Change" shirt, Sarah Jessica Parker joined volunteers in making calls to undecided voters at the phone bank at the Obama NYC headquarters Thursday.

Check out photos of Barack Obama's biggest celeb fans!

"She wanted to get involved anyway she could!" a campaign source told Usmagazine.com. "She came and ended up staying until the end of her shift and made a ton of calls. She came to work not for a photo-op!"

Also making recruitment calls?

Parker's husband actor Matthew Broderick, who will be at the NYC headquarters Sunday night, and Soprano alum Edie Falco, who will work out of Jay-Z's 40/40 club. Uma Thurman is also expected at a downtown location.

See Barack Obama's family album.

Meanwhile, Tyra Banks endorsed the Democrat presidential nominee on Saturday.

"Throughout this historic presidential campaign, I have been inspired by Senator Barack Obama and his message of change," Banks told Us. "I believe he will uplift all Americans during these critical times. I will be voting for Obama because I feel America is not only ready for this change, we are in need of it."

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