There's no separate poll number for only the "sweats the details" Catholics.
The "sweats the details" people are a small number, but they voted overwhelmingly McCain. (Anecdotally, I know maybe 30-40 of them here, and none of them were Obama supporters.)
I disagree. I had originally aligned "weekly mass" with "sweat the details", but "Sunday morning crowd" is defined by the article as the true Catholic swing vote. Let's look at the top three conservative-voting Catholic groups again:
55% McCain, 43% Obama - Weekly mass-attending Catholics
52% McCain, 47% Obama - White "regular-mass-attending" Catholics
51% McCain, 49% Obama - White Catholics
In each of the last three Presidential elections, the Catholic vote was consistently split about 55/45 between the main candidates. And all of the above groups demonstrate a "swing vote" kind of split. I don't define a 55/45 split as an overwhelming vote for one candidate, and that's why I don't associate "weekly Mass attending" (nor does the article) with "sweat the details", but instead why I chose to leave that last section blank. The article says the "sweat the details" group (and I quote) almost always backs the Vatican on doctrinal matters. I don't equate 55/45 with "almost always".
FWIW, I am likely to concede that there's a conservative Catholic demographic - possibly the "sweat the details" Catholic - who voted overwhelmingly for McCain, but as you rightly point out, there are simply no polling numbers that capture it. As this article states (and I'm forced to agree), it must be a "small slice of the American Catholic pie."