Good find.
I didn't find it. It was posted on FR yesterday on another thread. However, at least one of the two pics originally came from here (Yahoo/AP):
http://news.yahoo.com/nphotos/slideshow/photo//080829/480/8210e222956f4d21b1449107ae90d1a5/#photoViewer=/080829/480/8210e222956f4d21b1449107ae90d1a5
Try this one. It was photo 467 of 649:
http://news.yahoo.com/nphotos/Democratic-National-Convention-Senator-Joe-Biden-2008-Democratic-National-Convention-Michelle-Obama-vice-presidential-nominee/ss/events/pl/073008dncdemocratcon/im:/080829/480/8210e222956f4d21b1449107ae90d1a5/