Here are some details from Beliefnet.com about the Catholic response at the elections.
The rap on Obama during the primaries was that he couldn’t win because he struggled with Catholics. Apparently, he got past that. Early exit polls indicate he won 54% of the Catholic vote compared to 45% for John McCain. George W. Bush won the Catholic vote 52%-46%.
He also improved among white Catholics, according to the early exit polls. Bush got 56%-43% As of now, McCain lead by just 51%-49%
This was despite an aggressive push by more than 50 Bishops to encourage Catholics to focus on abortion as the central issue.