The Democrat challenging Paul Ryan in the House race in southern Wisconsin is turning up the pressure on the Republican incumbent to hold a congressional campaign debate. Paul Ryan is running for both vice president and for re-election to the House of Representatives. Ryan is gearing up for a vice presidential debate next week, but Democratic House candidate Rob Zerban also wants to debate Ryan soon. Zerban dropped off a couple boxes of petition signatures from debate supporters at Ryan's house campaign office in Janesville. Zerban concedes that most of the 50,000 signatures he says are on the forms are from outside Wisconsin. But he says newspaper editorial boards and others  in Wisconsin are also calling for a Ryan-Zerban debate. Ryan's House campaign says Democrats running for vice president and congress have not agreed to congressional debates over the last 15 years. The campaign calls Zerban's signature drop-off a stunt. Ryan's TV commercials for his House race continue to air.