WASHINGTON (AP) — Democratic candidate Barack Obama on Saturday backed away from John

WASHINGTON (AP) — Democratic candidate Barack Obama on Saturday backed away from John McCain’s challenge for a series of joint appearances, agreeing only to the standard three debates in the fall.

In May, when a McCain adviser proposed a series of pre-convention appearances at town hall meetings, Obama said, “I think that’s a great idea.” In summer on the campaign trail, McCain has often noted that Obama had not followed through and joined him in any events.

On Saturday, in a letter to the Commission on Presidential Debates, Obama campaign manager David Plouffe said the short period between the last political convention and the first proposed debate made it likely the commission-sponsored debates would be the only ones.

“We’ve committed to the three debates on the table,” campaign spokeswoman Jen Psaki said Saturday in an interview. “It’s likely they will be the three appearances by the candidates this fall.”

Asked by The Associated Press if that meant Obama would not agree to any other debates, Psaki said, “We’re not saying that.” She said the McCain campaign had rejected Obama’s proposal for two joint town hall meetings.

The McCain campaign did not respond to a request for comment.

The first debate planned by the commission is set for Sept. 26 in Oxford, Miss., three weeks after the Republican National Convention concludes Sept. 4. The Democratic convention is scheduled for Aug. 25-28.

The other presidential debates are set for Oct. 7 and Oct. 15 and the vice presidential debate for Oct. 2.

A day after Obama clinched the Democratic nomination in early June, McCain challenged him to 10 town hall meetings with voters in the months leading up to the conventions. The candidates’ campaigns began negotiations, saying they agreed in spirit to the joint appearances.