♪ Obama's gonna change it ♪
Everybody sing!
Sing what you want, but it wasn't President Obama who created/changed it...Blame Barney Frank, Chris Dodd, et al., for collapsing the economy (which has made recruiting easier).
I do put a large part of the blame on President Bush, though, for remaining aloof and not addressing those things that made the war so unpopular (and, thus, hard to recruit for). As one example, he could have helped the military immensely by accepting Donald Rumsfeld's resignation rather than continue to have him blather in denial about there being no insurgency while the whole world (and the general right next to him) knew how ridiculous the claim was.