WASHINGTON -- If recent history is a guide, the mass shooting in Aurora, Colo., on Friday is unlikely to move poll results about guns rights and gun control in any lasting way.Thirteen years ago, another shooting rampage at Columbine High School, not far from Aurora, produced a brief bump in support for stricter gun laws, but that new support had eroded a year later and ultimately gave way to a longer-term decline.The Columbine shootings attracted by far the most public interest of any news story in 1999, according to the Pew Research Center.