But alas, we shouldn't: primarily because we're not all one or another, no matter what the politics may think.
Actually, the map above is quite interesting: note that there are a number of pure red areas, and a number of pure blue areas, but not where you think: the "blue states" are very mixed, while the "red states" tend towards the extremes. In texas, we've got some very, very blue areas towards the bottom, and some very red areas at the top. Alabama and Mississippi have some extreme blue parts, especially around the cities and the Missippi river. And one county in South Dakota, next to Nebraska, is more blue than San Francisco. Definitely take a look.