WASHINGTON -- The Senate set a long-awaited vote for Wednesday on a bipartisan plan for expanding background checks to more firearms buyers, with supporters facing a steeply uphill path to victory.
By scheduling the roll call, Senate leaders ensured a showdown over the cornerstone of an effort by gun control supporters to tighten firearms laws following December's killings of 20 students and six aides at an elementary school in Newtown, Conn.
The Senate planned to vote on eight other amendments as well to a Democratic gun control bill that, besides expanding background checks, would tighten laws against gun trafficking and boost aid for school safety.
They included Democratic proposals to ban military-style assault weapons and high-capacity ammunition clips, which are expected to lose; a Republican proposal requiring states to honor other states' permits allowing concealed weapons, which faces a close vote; and a broad GOP substitute for the overall gun measure.
The focus of both sides has been on a compromise by Sens. Joe Manchin, D-W.Va., and Patrick Toomey, R-Pa., broadening background checks. It will be the first amendment voted on Wednesday. Despite appearances at the Capitol on Wednesday by wounded former Rep. Gabrielle Giffords, proponents seem to face enough potential opponents to derail their endeavor unless they can figure out how to win more votes.
No. 2 Democratic leader Richard Durbin of Illinois, his party's chief vote counter, left a lunch of Democratic senators saying they would need support from nine or 10 Republicans -- a tall order.
Attending Tuesday's Senate lunch was Giffords, the Arizona Democrat severely hurt in a 2011 mass shooting in Tucson, and her husband, retired astronaut Mark Kelly. The two, gun owners both, have started a political committee that backs candidates who favor gun restrictions.
"His message was, 'We've been through this,'" Durbin said, describing Kelly's remarks to the lawmakers. "'We're ready to fight back to stand up for those who have the courage to vote for gun safety.'"
Giffords did not address the lawmakers.
In a blow to gun control advocates, Sen. Dean Heller, R-Nev., became the latest Republican to say he will oppose a bipartisan compromise broadening background checks.
"I believe that this legislation could lead to the creation of a national gun registry and puts additional burdens on law-abiding citizens," he said.
Before the lunch, Giffords and Kelly met privately with Manchin and Toomey. Their compromise would expand background checks to cover private purchases at gun shows and via the Internet, a plan gun control supporters think gives them the best chance of pushing a broader system of checks through the Senate.
"They're helping immensely just by being here and talking to our colleagues. We're close, but we sure need their help," Manchin said after that meeting.
Manchin and Toomey were no longer considering a change to their bill to exempt people who live far from gun dealers, making it difficult to go to the dealers' shops to have background checks performed. The hope had been to attract votes from Alaska and North Dakota senators, and the sponsors' decision to move ahead without it seemed to suggest that the effort to win over those senators would fail.
Background checks are aimed at weeding out criminals and the seriously mentally ill from getting firearms through legal means. The current background check system applies only to transactions with licensed gun dealers.