You are saying that democrats do win because of the Catholic vote, and the reason the republicans won the popular vote in 2004 is because when Protestants can get 50 or 51% of the Catholics to vote pro-life conservative, then the democrats lose.
I think that is what the point is, the fact that the Catholic vote is what the democrats depend on and pin their hopes on, and they pray for more Catholics and atheists.
I am saying precisely the opposite.
The numbers indicate that the Democrats do not require the Catholic vote while the Republicans do.
If you remove the entire Catholic electorate - Obama still wins in both 2008, and in 2012.
If you remove the entire Catholic electorate in 2004, Bush loses.
Ergo, I conclude that the Republican party now requires the support of Catholics in order to win. The Democrat party does not.