SC didn’t have a popular vote for president until Reconstruction; from 1832 to 1860 it was the only state still to have it’s state legislature elect its presidential electors.
Ah, my second goof (it’s getting late). I kept thinking SC had withdrawn, but you’re right, that was a legislative vote, for which went to Breckinridge, so that should be 33 states that participated, with 32 voting directly for the electors.