| Yr | D | R | ||
| 1952 | 56% | 44% | ||
| 1956 | 51% | 49% | ||
| 1960 | 78% | 22% | Kennedy | |
| 1964 | 76% | 24% | LBJ | |
| 1968 | 59% | 33% | ||
| 1972 | 48% | 52% | ||
| 1976 | 57% | 41% | Carter | |
| 1980 | 46% | 47% | ||
| 1984 | 39% | 61% | ||
| 1988 | 51% | 49% | ||
| 1992 | 47% | 35% | Clinton | |
| 1996 | 55% | 35% | Clinton | |
| 2000 | 52% | 46% | ||
| 2004 | 52% | 48% | ||
| 2008 | 53% | 47% | Obama | |
| 2012 | 56% | 44% | Obama | |
| 2016 | 45% | 52% |
Not everyone who claims to be Catholic actually is in good standing.