President Obama is applauded after signing the health care overhaul during a ceremony in the White House on March 23, 2010. Then-Gov. Mitt Romney signs a Massachusetts health care overhaul at Faneuil Hall in Boston on April 12, 2006. Win McNamee/Boston Globe via Getty Images hide caption

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While a student at Harvard Law School, Barack Obama became the first black president of the Harvard Law Review. AP hide caption

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Mitt Romney already had a young family during his time at Harvard, which set him apart from most other students. Here, Romney is with his wife, Ann, and two sons at a business school clambake in 1973. Courtesy of The New York Times hide caption

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Barack Obama, then a Democratic candidate for a U.S. House seat, delivers his concession speech to supporters, while his wife, Michelle, tends to their daughter, Malia, on March 21, 2000, in Chicago. Frank Polich/AP hide caption

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Sen. Ted Kennedy, D-Mass., and Republican challenger Mitt Romney (right) take part in a televised debate at Holyoke Community College in Holyoke, Mass., in 1994. Romney lost to Kennedy in his first political race. Charles Krupa/AP hide caption

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Former Massachusetts Gov. Mitt Romney and President Obama will spend the next six months highlighting their differences. But they also share some striking similarities. Chip Somodevilla/Olivier Douliery/Getty Images hide caption

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