Now two other guests at the same dinner, given by the actress Candice Bergen, at her home in Beverly Hills, say they heard much the same thing as Ms. Huffington. Both of them, the former “West Wing” actors Bradley Whitford and Richard Schiff, were asked by Ms. Huffington to speak to The New York Times. Mr. Whitford said he would be supporting the Democratic nominee and had donated to Senators Hillary Rodham Clinton and Barack Obama; Mr. Schiff is supporting Mr. Obama.

Image Ariana Huffington, the liberal blogger. Credit... Chester Higgins Jr./The New York Times

Mr. Whitford, who played Josh Lyman, the deputy White House chief of staff on the NBC series, said in a telephone interview on Thursday that he was sitting across from Mr. McCain and next to Ms. Huffington at the small dinner and that he was startled to hear the senator sharply criticize Mr. Bush. The senator has long blamed the Bush campaign for smear tactics against his family in the 2000 South Carolina primary, but by the end of the campaign Mr. McCain was publicly supporting his rival.

“McCain was just sort of going off on how much he disliked Bush and the horrible things that the Bush campaign had done to his family in South Carolina, and his exasperation with Bush about his ridiculous tax cuts and he really wanted to talk to him about it, but he said the guy doesn’t have the concentration, and you talk for 10 minutes and then the guy wants to talk about baseball,” Mr. Whitford said.

Another guest then asked Mr. McCain, Mr. Whitford recalled, whether he had voted for Mr. Bush. “And he put his finger in front of his mouth and mouthed, ‘No way,’ ” Mr. Whitford said.

Mr. Schiff, who played Toby Ziegler, the White House communications director on “The West Wing,” said he was listening to Mr. McCain from the other of the two tables in the room.