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Vice President Biden said he and President Obama will tour the country making the case for gun control laws – the centerpiece of which is a requirement that all gun buyers submit to a federal background check.

Biden, speaking to the U.S. Conference of Mayors, devoted the heart of his remarks to pushing the background check requirement twinned with pleas that state and federal governments share their information on prospective gun purchasers.

Obama has already begun recruiting supporters on the gun issue through both his campaign apparatus — which e-mailed supporters Thursday asking them to “stand with the president to reduce gun violence,” and the official Web site, but Biden’s remarks at the Capitol Hilton mark the first declaration that the White House plans to barnstorm to build support for its gun proposals.