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Catholics regularly vote Democratic, which is liberal, socialist politics. If it weren't for the Protestant voting block impeding it, we'd be in the same sorry state as Central and South America. And we're heading that way now, thanks to the help of the Catholics for all these decades.

From the GetReligion article Those consistently complex “Catholic voters”:

...let me once again share the four-pronged typology that a veteran priest here in Washington, D.C., gave me a few years ago. There are, he said, four kinds of Catholics in this country and, thus, four “Catholic votes” on almost any issue. Any news report that lumps these groups together isn’t worth very much.
* Ex-Catholics. Solid for the Democrats. Cultural conservatives have no chance.
* Cultural Catholics who may go to church a few times a year. This may be one of those all-important “undecided voters” depending on what’s happening with the economy, foreign policy, etc. Leans to Democrats.
* Sunday-morning American Catholics. This voter is a regular in the pew and may even play some leadership role in the parish. This is the Catholic voter that is really up for grabs, the true swing voter that the candidates are after.
* The “sweats the details” Roman Catholic who goes to confession. Is active in the full sacramental life of the parish and almost always backs the Vatican, when it comes to matters of faith and practice. This is a very small slice of the American Catholic pie.

2008 Presidential Election demographics, footnoted and annotated
Your "by the numbers" breakdown of the 2008 vote, with emphasis on the Catholic voter (as of 04/07/09):

55% McCain, 43% Obama - Weekly mass-attending Catholics ^6,9
52% McCain, 47% Obama - White "regular-mass-attending" Catholics¹²
52% McCain, 47% Obama - White Catholic¹⁴
51% McCain, 49% Obama - White Catholics^1,7,11
45% McCain, 54% Obama - Catholics^{1,4,6,8,9,10,11,12}
45% McCain, 54% Obama - Catholic¹⁴
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
⁴ Obama's Religious Appeal: Still Missing Evangelicals - which TIME renamed as Obama: Bringing (Some) Evangelicals In
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
¹⁴ Pew Forum - How The Faithful Voted

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.

Other resources:
With the Help of Catholics…Obama’s Victory
Results! Evangelicals
Mainline Protestants and Latino evangelicals surge toward Obama [pre-election article]
Poll: Latino Protestants switching back to Democrats this election [pre-election article]
The Hispanic Protestant swing vote [pre-election article]
America spoke
Believers in the Pews--and the Polling Booth
McCain Beats Bush on Evangelical Vote