So why did McAuliffe underperform?
Being Terry McAuliffe didn't help, for one.
And that's an understatement.
I predicted earlier that the polls putting McAuliffe out in front at the level they put him were wrong. I also predicted that the relative unsavory image of McAuliffe would enable Cuccinelli (who, whatever his issue positions, was not considered the sleazebag McAuliffe was in some circles) to mount a comeback, and, while he did not prevail, I believe that this is what happened.
Cuccinelli did not lose because of his social conservatism. Cuccinelli lost because the national GOP gave up on the race. Unwisely, I might add, because Terry McAuliffe was a candidate with an absolute slew of weaknesses. It is a sign of weakness among the national GOP that they could not prevail on Lt. Gov. Bill Bolling to endorse Cuccinelli; this race was important to the national party and had implications beyond Virginia. Failing to do so left the GOP with a Gubenatorial nominee unendorsed by a sitting Lt. Governor of his own party, who is now damaged goods in future elections because of his failure to endorse Cuccinelli, which weakened the GOP even further. Cuccinelli was a vocal pro-lifer, but his issue positions weren't so far out of line as to be remarkable for a statewide VA candidate; he was no Todd Aiken and no Richard Murdouck. The GOP needed to put more money into Cuccinelli's race, and it needed to twist a few arms of key Republicans to, at a minimum, endorse the ticket. Virginia is steadily trending Democratic; one wonders why the national GOP, by ignoring a winnable race, chose to help that process along.