Pivotal votes on Colo. gun-control measures March 8, 2013 at 11:37 PM CST - Updated June 15 at 1:10 PM By IVAN MORENO and KRISTEN WYATTAssociated Press DENVER (AP) - Colorado Democrats are moving ahead with expanding background checks on private firearm purchases and a new ban on gun ownership by people facing domestic-violence accusations. The bills were given initial approval Friday in the state Senate. The debate is being watched closely because some see it as a testing ground on how far the nation is willing to go with new gun laws in the wake of mass shootings in Connecticut and suburban Denver. Colorado lawmakers also are debating limits on the size of ammunition magazines. Supporters face powerful opposition from gun-rights advocates. Democrats hold an advantage in the Colorado Senate and can pass the bills by a narrow margin. But Republicans need only three Democrats to vote no to defeat any bill. Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.