DuPage county went to Obama by about 54%. If you don't believe this, feel free to go to USElectionAtlas.org or CNN Election 2008 page, click on "Illinois" and select election results by county.
Well, now that I think about it, social conservatives never liked McCain and probably stayed home or didn’t vote for him in particular. Illinois was a lost cause anyway as it is Obamaland, so conservatives in DuPage Country probably didn’t even bother. I almost didn’t, as I never liked McCain. Too many people moving into DuPage from Chicago probably also. However, our County Board remains predominantly Pub, which makes me think lots of conservatives didn’t pull the lever for McCain while voting for other conservatives.