Vice President Joe Biden reassured leading gun control groups Thursday that the administration remains committed to pushing an expansion of background checks for gun purchases through Congress, according to one of the event's attendees.Biden, who has led the administration's efforts on gun control in the wake of the shooting in Newtown, Connecticut, told the meeting of about 15 participants that despite last week's defeat of a bi partisan measure in the Senate to expand checks at gun shows and online sales, that this was just the beginning.

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