This doesn’t come as much surprise of course. We always knew the protesters were anti-Bush, and anti-capitalism rather than anti war. A study has just been released (PDF here) by a couple of college professors and they have found that-
After January 2007, the attendance at antiwar rallies [measured in] roughly the tens of thousands, or thousands, through the end of 2008.
After the election of Barack Obama as president, the order of magnitude of antiwar protests dropped […] Organizers were hard pressed to stage a rally with participation in the thousands, or even in the hundreds. For example, we counted exactly 107 participants at a Chicago rally on October 7, 2009.
Hat tip John Stossel.