(AP) — Tea-party challenger Milton Wolf confronted U.S. Sen. Pat Roberts during a walking tour in eastern Kansas on Wednesday, interrupting the senator's campaign stop to call attention to his refusal to have debates ahead of the Republican primary. The senator said earlier in the campaign that he was willing to have debates while noting that two other, lesser-known candidates also are seeking the GOP nomination. [...] Roberts' executive campaign manager said earlier this month that the senator would not debate Wolf because of the challenger's "vague rhetoric and false attacks." The senator's campaign is running statewide television ads highlighting news reports about a state medical board investigation of Wolf's past posting of X-ray images of fatal gunshot wounds and serious medical injuries, along with dark-humor commentary, on a now-disabled personal Facebook page in 2010. "Let a desperate candidate with an immature record and an unethical record pull stunts like this and let Sen.