What do Jessica Biel, Ryan Reynolds, Scarlett Johansson, Kate Walsh and Taye Diggs have in common? They're all backing Democratic presidential primary candidate Barack Obama.

And these stars - along with musical acts Goo Goo Dolls and Ne-Yo - are coming together to support their pick for prez at the "Los Angeles Generation Obama Concert" next Monday at L.A.'s Gibson Amphitheater.

Jessica Biel and Other Stars to Back Obama at Hollywood Concert Tuesday December 4, 2007
http://www.usmagazine.com/jessica_biel_and_other_celebs_love_obama

Justin Timberlake and Jessica Biel made a rare appearance together Saturday at a Las Vegas rally for Barack Obama.

Timberlake performed an off-the-cuff riff, singing "Vote in a Box," a spoof of his infamous raunchy Saturday Night Live sketch, a campaign source tells Usmagazine.com.

"Me and Jess, we're here as Americans. We're here as humans because this is something we had to do," Timberlake told the crowd at the Clark County Government Center amphitheater, according to the Las Vegas Review-Journal.

He added, "We've never publicly endorsed before. But we've never been so inspired by one person."

Justin Timberlake, Jessica Biel Rally for Barack Obama in Vegas Monday October 13, 2008
http://www.usmagazine.com/news/justin-timberlake-jessica-biel-rally-for-obama?page=4

We're with JACK BLACK, and more as the stars raise funds and awareness for White House hopeful JOHN KERRY.

Hot on the heels of White House hopeful JOHN KERRY's announcement of JOHN EDWARDS as his vice-presidential running mate, more stars in Hollywood came out Tuesday night to support the popular Democrat's bid.

Tonight on ET, we're with JACK BLACK, "7th Heaven" star JESSICA BIEL, DAVID SPADE and more as they raise both funds and awareness for their candidate!

July 07, 2004
Hollywood Stars Anchor Kerry
http://www.etonline.com/celebrities/33969/index.html