The next day, Colorado's governor called for background checks on all gun sales, not just those purchased at retail stores or at gun shows. In Arizona, a Democratic state senator is seeking to force the same step.
"The governor generally opposes efforts that would infringe on the rights of lawful gun owners," said Matthew Benson, a spokesman for Arizona Gov. Jan Brewer, R.
In California, a Democratic state senator proposed requiring permits and background checks to buy ammunition. In Florida, a state House Democrat's bill would allow for limits on carrying concealed weapons and ammunition on public property.
The Democratic governors of Maryland, Connecticut and Delaware are preparing their own proposals for restrictions.
In Oregon, Gov. John Kitzhaber, D, is awaiting recommendations of his staff and favors banning assault weapons, said Tim Raphael, a spokesman.
"The governor really sees no reasons for citizens to own assault weapons," Raphael said.
In Illinois, Gov. Pat Quinn, D, supports a ban on assault weapons, said a spokeswoman, Brooke Anderson. A similar measure failed to advance in the legislature last year after opposition from gun groups, including the NRA.
Richard Pearson, executive director of the Illinois State Rifle Association, which opposed the bill, said he's poised for a fight when it's revived in the legislature this year.
"It's going to be a long and tough fight," he said.
Since the Connecticut shooting, many state Republican leaders have responded by calling for improvements in mental- health programs and school safety, not curbs on guns.
Louisiana Gov. Bobby Jindal, R, ordered a commission to scrutinize safety in schools. In South Carolina, a Republican lawmaker is seeking to allow teachers to carry concealed weapons into school. In Texas, Lt. Gov. David Dewhurst, R, said he's in favor of funding firearms training for school teachers or administrators.