CBS LAS VEGAS- Vice President Joe Biden has been tasked with coming up with recommendations for curbing gun violence. On Thursday he met with the National Rifle Association and gun rights groups. The meeting lasted more than ninety minutes. Afterward, CBS News spoke with NRA President David Keene, who did not attend the session with Biden. He described the conversation as one-sided. “We were disappointed in a sense, because prior to the meeting, they made a number of statements from the White House that they haven’t made up their mind,” Keene said. “But at the meeting, the vice president made it clear that in terms of firearms, they have made up their mind.” Do you favor Vice President Joe Biden’s proposal to require gun buyers to submit to a “universal background check”-even for private sales and those at gun shows? Callers tell us what they think about Vice President Joe Biden’s proposal.