Obama defectors

The election comes down to those who voted for President Obama in 2008 and will either vote for Mitt Romney Tuesday or stay home.
The Washington Post put the number of Obama defectors at 13 percent.
Ace tries to look at the numbers.
70 million voted for Obama in 2008; 60 million voted for McCain.
13% of 70 million is 9.1 million. Subtract that from 70 million and add it to 60 million and you get... Look, I don't do math. I'm just an unfrozen caveman blogger. Your strange world of magic scrawlings confuses me.
I think it means President-elect Romney.