Why many Romney voters prefer Obama over Santorum: 3 theories

Pew finds that a surprising 20 percent of Romney supporters would switch sides if Santorum got the GOP nod. What would cause them to defect?

Many centrist Mitt Romney supporters would vote for President Obama over Rick Santorum, according to a new Pew poll.
(Image credit: Whitney Curtis/Getty Images)

Conservative Republicans may be wary of Mitt Romney, but the party's moderates appear even more dismissive of his leading conservative rival, Rick Santorum. In fact, a new Pew poll found that 1 in 5 Romney supporters, including independents and some centrist Republicans, would switch sides and vote for President Obama if Santorum became the GOP presidential nominee. Why would they defect? Here, three theories:

1. Santorum is putting ego ahead of party

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