Catholics do not ignore it, they vote Democrat, 54% of Catholics voted for Obama. Protestants as usual, voted Republican.
Even within the Hispanic vote Catholics are a solid Democrat constituency at almost 70%, while Protestant Hispanics are a roughly 50/50 vote, without Catholics the American left would be sucking air.
"Ignoring" it, is liberalism.
In 2004 Catholics went 52% to 47% for Bush.
In 2008 white Catholics went for McCain 52% to 41%.