Obama says won't campaign for any Democrat who doesn't back gun reforms

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"I will not campaign for, vote for or support any candidate, even in my own party, who does not support common-sense gun reform," Obama wrote in an op-ed column in the New York Times.

"All of us need to demand leaders brave enough to stand up to the gun lobby’s lies," Obama wrote. "All of us need to demand that governors, mayors and our representatives in Congress do their part."

(Reporting by Roberta Rampton; Editing by Eric Walsh)