Democrat Mark Udall leads Republican Bob Schaffer 51 percent to 38 percent in the race for Colorado's open Senate seat, amassing winning margins among both sexes and all ages in a
Rocky Mountain News-
CBS4 poll released Sunday night. Udall trounces Schaffer among the state's unaffiliated voters — 62 percent to 20 percent — surpassing Democratic presidential nominee Barack Obama's 58 percent support among the group, according to the same news organizations' poll released late last week.