DENVER (CBS4) – Former U.S. Rep. Gabrielle Giffords and her husband, astronaut Mark Kelly, canvassed a Denver neighborhood for Hillary Clinton on Sunday.

On Saturday the couple held a roundtable discussion with local advocates on gun control. They say Clinton is the only candidate who can reduce gun violence.

Clinton and Bernie Sanders both spoke in Denver Saturday night.

Sanders is back on the campaign trail after speaking to a crowd of about 18,000 at the Colorado Convention Center.

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