Driving the news: Some top GOP operatives, privy to data from swing states, tell me that this week’s chaotic presidential debate had a calamitous effect on Republican chances in tight Senate races.

“The bottom is falling out everywhere,” said a longtime Republican insider.

This insider said the debate didn’t faze hardcore Trumpers. But he said it turned off “open to Trump” swing voters, especially women in suburbs.

“Everyone knew Trump was capable of this kind of behavior,” the insider said. “But these voters had never had 90 straight minutes of that behavior thrust in their faces.”

An outside presidential adviser cautioned that Senate races “really turn on different voter impulses” than the presidential race.