U.S. Rep. Rush Holt, D-N.J., a former Princeton researcher who has supported science funding, says he will not seek another term. Holt, a five-time "Jeopardy!" winner, has a background in physics. "My science training is good problem-solving training, but there are also matters that come before Congress that have scientific or technical components that get very little attention," he said in a 2008 interview.

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