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Chalk up another victory for the Iowa Electronic Markets. The University of Iowa tool, which Inside Higher Ed profiled last fall ahead of the Iowa caucuses, allows people to invest small amounts of cash in support of candidates for political offices or positions on various other matters, and the markets have a good track record of predicting outcomes. The market for the Republican presidential race had lots of variation last summer, but since September 2011, the investors' choice has been Mitt Romney, who on Tuesday became the presumptive nominee when Rick Santorum suspended his campaign.