The results from the 14th District are very interesting. As I noted in my "
Turning-Point Election" thread, there has been a leftward movement in suburban areas across the nation, and IL-14 may be part of that movement. On the other hand, there are a number of other factors to consider. It was a bye-election, and turnout was very small. Still, in a district that is heavily Republican, that should not have mattered much. Furthermore, as I think
JPB pointed out, Foster had the good fortune of running against Jim Oberweis, who is a much-disliked figure in Illinois politics. Of his previous five campaigns, he won two: the GOP nominations for the special and general elections in the 14th District, and he won them both on the same day against a splintered opposition. Oberweis is, I believe, considered by many a nasty campaigner, and he goes negative almost immediately in every election (both Oberweis and Foster traded rather vicious ads during the runup to the special election). Voters have shown pretty consistently that they just don't like Oberweis as a politician (as an ice cream vendor, however, he's ok), and that may have depressed Republican turnout for the election. That's not a good sign for GOP prospects in the general election, where the same two candidates will square off against each other.
Getting back to the theme of this thread, one of Foster's great assets in this race was Obama's endorsement. Obama filmed two commercials for oster which ran in the Chicago tv market (even though none of IL-14 crosses the city limits). For those who say that endorsements don't matter, it's quite evident that, at least in Illinois, that's not the case. Obama's coattails are pretty formidable, and Obama has already carried one of his protegés into a statewide elective office largely on the strength of his endorsement (state treasurer Alexi Giannoulias). In contrast, McCain's endorsement of Oberweis did little -- except perhaps to take some of the burnish off of McCain's reputation.