True.
Voting behavior in the US is more determined by racial ID and than it is by religious ID.
Or by geography as well. White Catholics and non-evangelical White Protestants vote mostly the same way. White Catholics went a little more for Romney last time and a little more for Obama the time before that, but by and large in areas without large evangelical or fundamentalist populations, Catholics vote like their Protestant neighbors.
What throws things off is first of all the non-White vote. Latinos are a larger percentage of the Catholic population than Blacks are of the Protestant population so this skews Catholic numbers to the Democrats. Secondly, White Evangelical Protestants -- especially Southerners -- have been voting much more heavily for Republicans than the rest of the country in recent decades so this skews the Protestant numbers to the Democrats.
If there's anything more to it than that, it's that groups that consider or once considered themselves to be outsiders trend a little more to the left than groups the consider or consider themselves to be the mainstream. That's true of African-Americans, Jews, Latinos, and Asians in the US, Catholics in Britain and Australia, and Protestants in France.
There is still in some Catholics a feeling of being or having been outsiders that makes Catholics a little more likely to vote Democrat than Protestants living in the same area and under the same circumstances. Given that we all have our quirks, is it really worth making a big deal about that?
The Catholic vote is pretty much the same it has always been.
The left counts on importing millions of Catholic voters from the most Catholic nations in the world, and Catholics don’t seem to care.
Here we are on a conservative political site, and we get all kinds of acrobatics to prevent discussing a left voting major church denomination and what it is doing to our conservative goals.