DES MOINES, Iowa --Massachusetts Sen. John Kerry lashed out Sunday against a group that bashed him during his last run at the White House. Kerry, who made a weekend appearance in northwest Iowa, said he is concerned that Swift Vote Veterans for Truth is again resorting to "the politics of fear and smear." The group, financed by Texas conservatives, ran commercials questioning his claim of being a decorated Vietnam veteran -- the centerpiece of his presidential campaign in 2004. "We're not going to give them an ounce of daylight," said Kerry, who is considering another run at the Democratic presidential...