From Yahoo! News:
Speculation has been ramping up over who Republican presidential candidate Mitt Romney will choose as his vice-presidential candidate, as a top campaign advisor suggested that his pick could come at the end of the week.... A study by Bernard Grofman and Reuben Kline, political scientists at the University of California, Irvine, evaluated the impact of vice presidential selection on voter choice. It found that the net impact of vice presidential selection is at most one percentage point in total votes. And in 2008, the impact was about one-half of a percentage - slightly lower than the historical average.

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