Your afternoon reading:

• "The bounce that candidates receive in the polls after a primary or caucus is typically as much a function of exceeding expectations as their actual performance. Although Mitt Romney won the Iowa caucuses by eight votes, it looks as though Rick Santorum will see the largest improvement in his poll numbers." — First Post-Iowa Polls Show Bounce for Santorum, FiveThirtyEight

• "Why did Mr. Perry decide to remain in the race? Knowing the answer is crucial to understanding whether Mr. Perry has any chance of mounting a comeback — and how his decision might reverberate upon Mitt Romney and the ...

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