2% would not have been the margin. Obama would have won by 7-10%.
How much of the “women’s vote” did Santorum get in Missouri, Tennessee, Colorado, Alabama, Kentucky, Mississipi, Louisiana and other states he won, and in Michigan and Wisconsin where he got within 3-5% of Romney who outspent him by about a hundred million bucks?
Santorum turned out to be a real sleeper and was coming on strong when the GOP-e smothered his inconveniently successful campaign