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When measuring the Catholic vote, I think it is important to distinguish between practicing Catholics who regularly attend Mass versus the non-observant. Without having access to any figures before me, I would be willing to bet that John McCain won the observant Catholic vote. Does anyone seriously consider people like Nancy Pelosi, Joe Biden, and Ted Kennedy to be genuine Catholics?

When measuring the Catholic vote, I think it is important to distinguish between practicing Catholics who regularly attend Mass versus the non-observant. Without having access to any figures before me, I would be willing to bet that John McCain won the observant Catholic vote.

You'd win your bet. You can find a detailed breakdown of the polling numbers on my profile page; here are the relevant ones for Catholics of all stripes:

55% McCain, 43% Obama - Weekly mass-attending Catholics ^6,9
52% McCain, 47% Obama - White "regular-mass-attending" Catholics¹²
51% McCain, 49% Obama - White Catholics^1,7,11
45% McCain, 54% Obama - Catholics^{1,4,6,8,9,10,11,12}
37% McCain, 61% Obama - Non-weekly-mass-attending Catholics^6,12
xx% McCain, 67% Obama - Hispanic Catholics^8,11**,***, ****

** No source provided voting percentages for the other party.
*** Associated Press (citation #11) reports this number as 72%, instead of the 67% other media gave it.
**** Note that some media are reporting the same numbers for the Hispanic and Black vote in general, as well as for those same groups with Catholic or Protestant affiliation.

Citations:
¹ The Awesome Blue God -- How Obama Forged A New Faith Coalition
² Exit polls: 78% of Jews voted for Obama
³ Utah's red loses some of its luster
⁴ Obama's Religious Appeal: Still Missing Evangelicals - which TIME renamed as Obama: Bringing (Some) Evangelicals In
⁵ The Evangelical Electoral Map
⁶ What's wrong with Catholic voters? What's wrong with Catholics?
⁷ Evangelical Voters Favor McCain by Wide Margins
⁸ Catholic voters heavily favored Obama, analysis shows
⁹ What Happened to the Catholic Vote?
¹⁰ Loyal to the End: Evangelicals Stay the Course
¹¹ Obama results show gains in key religious voters
¹² How the faithful voted
¹³ Exit polls: How Obama won

All numbers cited above are the earliest ones reported in the press. In cases of multiple reports, some percentages cited were not exact. However, the numbers above are within 2% of all sources cited, lending credence to the general number & placement overall.

“I'd be willing to bet that John McCain won the observant catholic vote.”

I'm not so sure. We know many observant Catholics who attend mass regularly, send their children to Catholic school with princess riverdawg, etc. but have Obama bumper stickers on their vehicles.