Four candidates left on the Republican side, and not one actual Protestant. I suppose that represents progress, of a sort.
Footnote Yes, Ron Paul is nominally a Baptist, but he named his son for Ayn Rand. Update This seems to be a mistake; per Warren Terra in comments, apparently the birth certificate says “Randal.” And Paul, whatever his theology, is certainly a WASP. But the fact that the one Protestant in the race is the one candidate certain not to get the nomination still shows that this is not your father’s GOP. Perhaps the Republicans, true to the Know-Nothing part of their heritage, will always be the party of exclusion, but precisely who gets excluded changes over time.