Jane Norton, Colorado’s former lieutenant governor, is hitting the trail with Sen. John McCain (R., Ariz.) as Tuesday’s GOP Senate primary approaches. Over the weekend, McCain traveled around the state with Norton, who faces Ken Buck, a prosecutor and tea-party favorite, in tomorrow’s contest. According to Public Policy Polling analysis released today, the race is still “too close to call,” with Norton ahead by a slight margin, 45 percent to 43 percent. Previously, in a poll commissioned by the Denver Post in late July, Buck led by nine points.

“Frankly, I think her kind of representation is important to the Republican party,” said McCain over the weekend. Though he “steered clear of trashing Buck directly,” The Hill reports that McCain did reference Norton’s rival on Sunday, imploring crowds to make sure “the Buck stops here.”