By Richard Perez-Pena and Susan Saulny
BOULDER, Colo. — Public colleges and universities have become a major front in the nation’s debate over guns as gun-rights advocates press to expand the right to carry concealed weapons, a campaign that gained steam after the 2007 shooting rampage at Virginia Tech, which left 33 people dead. And though guns remain banned from most state colleges, pro-gun forces, in a series of high-decibel legal and political battles, have made inroads on the issue in a handful of states, most recently Colorado.
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