DENVER-- U.S. Senator Michael Bennet and his Democratic primary rival Andrew Romanoff met for a debate in Denver last night. There wasn't much debate. The main area of disagreement came when Romanoff challenged Bennet to decline to accept Political Action Committee, or special interest, campaign money. The challenge was expected. Romanoff, who has lagged seriously behind Bennet in fundraising for half a year, announced in January that he was eschewing PAC money. The campaign had returned PAC money it received in the fall. Bennet dismissed the challenge on stage and he dismissed it more fully in comments he made to the Colorado Independent after the debate ended. He characterized the challenge as not fully considered and opportunistic. He also said it was unrealistic, given the price tag of a political race where Republican rivals were unlikely to voluntarily limit their fundraising abilities.