Independent businessman and political enigma Greg Orman (46 percent) is leading three-term Republican incumbent Pat Roberts (41 percent) in the race for U.S. Senate in Kansas, with 11 percent undecided, according to the latest Suffolk University/USA TODAY poll of likely voters in the general election. In the race for governor, Democratic state Rep. Paul Davis (46 percent) is leading incumbent Sam Brownback (42 percent), a Republican, with 6 percent undecided in the survey conducted by the Suffolk University Political Research Center in Boston.