Catholic and Republican

I often hear and read how many Catholics in this country refuse to identify with either of the two major political parties because, it is claimed, there are aspects in each party's national platform which run counter to the Catholic faith. It's pretty easy to see how this is true with the Democrat Party, what with its express support for abortion and homosexual rights (pg.38), as well as embryonic stem cell research (pg.31). I don't, however, see anything in the GOP platform which goes against unchangeable Catholic tenets. Am I missing something, or are people just talking out of their rear ends?