Voters are sick of foreign wars, not just the casualties but also the price tag. Moreover, it makes no sense for Washington to threaten military force to combat evil while pledging that any attacks will be "limited." Team Obama waved a white flag before firing a shot.
In short, Obamaland made a hash of the politics and the messaging. This president is so clueless about saber-rattling that when he threatened the use of military force, Putin knew how to turn Boxer and Obama's "moment" into an opportunity.