WASHINGTON - Just the other day, Rush Limbaugh chided Sen. Chuck Hagel for saying that the United States is in "deep trouble" in Iraq. "I know he served a stint in Vietnam," the widely known conservative said on his radio show, "but . . . does it qualify him for expertise everywhere around the world?" Other Republicans piled on. Hagel, a Republican from Nebraska, is a "traitor" and a "hand-wringer" who is undermining President Bush, they have said. Meanwhile, the Democratic presidential candidate, Sen. John Kerry of Massachusetts, praised Hagel last week on "Late Night with David Letterman." Hagel has...