<p>U.S. Congressman Seth Moulton, 46, will challenge Sen. Ed Markey, 79, in the primary next September. Moulton has made Markey's age a main sticking point in this race but Markey says he's "more energized than ever."</p>

U.S. Congressman Seth Moulton, 46, will challenge Sen. Ed Markey, 79, in the primary next September. Moulton has made Markey's age a main sticking point in this race but Markey says he's "more energized than ever."

Sen. Markey on his age and challenger: 'I feel more energized than ever'

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Sen. Markey on his age and challenger: 'I feel more energized than ever'

Sen. Markey on his age and challenger: 'I feel more energized than ever'

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