For Romney, history suggests VP pick will provide exceedingly modest bump, if any

Mitt Romney’s selection of a vice-presidential running mate, which he is expected to announce soon, could shed valuable light on how he makes big decisions. His choice could shore up what voters view as weaknesses or double down on what they perceive as strengths.

What it won’t do, if history and recent scholarship are any guide, is bring the Republican candidate a critical state or tip the balance in a close election. [cont.]

Bill Turque, Washington Post