WASHINGTON — Sen. John McCain, leading a blue-ribbon congressional delegation to Baghdad before Christmas, collected evidence that a "surge" of more U.S. troops is needed in Iraq. But not all his colleagues who accompanied him were convinced. What's more, he will find himself among a dwindling minority inside the Senate Republican caucus when Congress reconvenes this week.

President Bush and McCain, the front-runner for the next presidential nomination, in pressing for ...

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