Barack Obama won 13 of the 14 swing states in 2008. And he received a higher percentage of votes in nine of them than he did nationally.

StateWinner/margin
ArizonaMcCain/53.6%-45.1%
ColoradoObama 53.7%-44.7%
FloridaObama 51.0%-48.2%
IowaObama 53.7%-44.2%
MichiganObama 57.4%-41.0%
MinnesotaObama 54.1%-43.8%
NevadaObama 55.1%-42.7%
New HampshireObama 54.4%-44.7%
New MexicoObama 56.9%-41.8%
North CarolinaObama 49.7%-49.4%
OhioObama 51.5%-46.9%
PennsylvaniaObama 54.3%-44.0%
VirginiaObama 52.6%-46.3%
WisconsinObama 56.2%-42.3%
USAObama 52.9%-45.7%