Timing is everything:

Santorum mailer: Romney as GOP nominee ‘frightens me’

A Rick Santorum fundraising mailer that hit Iowa households Monday — nearly a week after he dropped his presidential bid — is raising eyebrows because it harshly attacks the presumptive GOP nominee, Mitt Romney.

The mailer, first reported by the Des Moines Register, contains a letter signed by Santorum that says, “It truly frightens me to think what’ll happen if Mitt Romney is the nominee.”

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OK, so I’m supposed to be frightened too?