Former Massachusetts Gov. Mitt Romney is the richest man in the presidential race.Presidential candidates are not required to disclose their net worth, and Romney has not. But analysts who track compensation in Romney’s business field said it was likely to exceed $500 million, according to a report in Saturday's New York Times.Romney built his fortune with the Boston-based Bain Capital, a venture and buyout firm. In 1984, Romney began investing Bain’s $40 million venture fund that eventually grew to billions. Romney’s fund was the first investor in Staples, the office supplies store. The Times also suggests that Romney has...