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“I am surprised that a young man has bought in to so many failed ideas,” he said.

Republicans also said Mr. Obama will have to broaden his own appeal and pointed to the demographics Mrs. Clinton won in the Democratic primaries that are prime targets for Mr. McCain as he tries to put together a “center-right” coalition: Catholics, union households, rural and blue-collar voters and seniors.

Frank J. Donatelli, deputy chairman of the Republican National Committee, said Mr. Obama’s coalition of primary voters followed the model of previous Democrats, such as George McGovern, Michael Dukakis and, to some extent, John Kerry, but focusing on minorities and white liberals.

“All those candidates wound up losing the general election, and they did so because they were unable to appeal the way a Democrat should to key voting blocks,” Mr. Donatelli told reporters Tuesday.

But a new series of polling by the Democratic firm Democracy Corps shows Mr. Obama’s appeal even in Republican-leaning congressional districts, suggesting that Mr. McCain will have some work to do in keeping his party’s own voters in line.