Obama campaign opens up about Biden's debate prep

WASHINGTON (AP) - President Barack Obama's campaign signaled their first debate strategy shift Thursday in a tweet.

Hours before the vice presidential debate, the campaign sent out a photograph on Twitter of Joe Biden rehearsing for the primetime event. There was the vice president, sitting side-by-side with his practice partner on a set designed to look like the debate stage at Centre College, where he and Republican running mate Paul Ryan would later face off.

That simple picture - and a flurry of other details the campaign released about Biden's pre-debate preparations - were a sharp departure from the campaign's approach in the lead-up to Obama's first debate with Mitt Romney. The campaign was so secretive about the president's preparation that they would barely confirm that he was practicing at all.