I don't know if Americans know or care how much the rest of the world is rooting for him.
a few weeks ago they polled cross-section of euros & it was somewhere like 65 - 70 to 30 - 35 in favor of obama
it may be even more by now
you americans are not just voting for your country, but for the future goodwill with europe for next few years - if obama lives upto his promises, we can see rapprochment with france ( which has been politically hostile to america for past 8y ), an improved relationship with germany ( has been a cool relationship since merkel came to power ), likely much better relations with britain ( we have cameron, a young, charasmatic obama-like opposing leader, who is likely to become prime minister - he is currently leader of the "republican" party in britain, but he has "connected" with obama - both young men with a similar vision of the world )
a strong american-euro relationship is probably most important international relationship in the world