As I wrote in June 2009, many proponents of Catholic Social Teaching would like to forget about Father Charles Coughlin, whose anti-Semitism went along with a statist mentality of income redistribution. Recently I linked to a Catholic Key Blog story about Campaign for Human Development's connections with SEIU, which brought a comment about a video from American Life League which demonstrates CHD's links to pro-abortion forces.
Another facet of Catholic Social Teaching is the "living wage" doctrine, which would pay people with kids more than people doing the same job with no kids. Most Americans have no interest in such feudalism.
Many Americans are calling the Obama administration socialist, but millions of Catholics could make the same complaint about "consistent life ethic" and other schemes their prelates devise.