In Madison? If Obama needs to shore up Madison, that is very, very good news for the Republicans.
I don't think it's as much "shoring up" as it is visiting "friendly" venues where he can get larger attendance numbers. The choice is made in order to create a false impression of the national enthusiasm for a second Obama term. The press will take the large turnout and present it as a broad base of strong support.
IOW, Madison is easily "in the bag" for Obama, and will turn out in droves.