WASHINGTON — Gov. Rick Scott of Florida, a Republican who is fighting a Democratic challenge from former Gov. Charlie Crist, was asked by The Miami Herald if he believes climate change is significantly affecting the weather. “Well, I’m not a scientist,” he said.

Senator Mitch McConnell of Kentucky, who is locked in a tight re-election race, was asked this month by The Cincinnati Enquirer if he believes that climate change is a problem. “I’m not a scientist,” he said.

House Speaker John A. Boehner, when asked by reporters if climate change will play a role in the Republican agenda, came up with a now-familiar formulation. “I’m not qualified to debate the science over climate change,” he said.