In political science, the conventional view is that polarization observed in the US is not a product of the two camps drifting further apart (in the sense of having more extreme views), it's the product of issue divisions aligning more closely to partisan camps. Consider Kim Davis. Kim Davis was a county clerk who went to jail after illegally refusing to issue a same-sex marriage certificate after the court system ru…
Catholics have always been, and continue to be, ~50/50 democrat/republican split, give or take a few points. Kennedy, Johnson, and Truman were the only democratic candidates who had >60% Catholic support.