WASHINGTON – Gun control advocates are hoping they can win by losing when the Supreme Court rules on state and local regulation of firearms.

The justices will be deciding whether the right to possess guns guaranteed by the Second Amendment — like much of the rest of the Bill of Rights — applies to states as well as the federal government. It’s widely believed they will say it does.

Additional Photos

Chicago firefighter Annette Nance-Holt, left, weeps as she recalls the death of her son, Blair, who was a victim of gun violence, during a news conference this month in Chicago. Behind her is her husband, Chicago Police Officer Ronald Holt. At right is Chicago Mayor Richard M. Daley. The Supreme Court this week will consider a gun rights case: McDonald v. Chicago. The Associated Press

But even if the court strikes down handgun bans in Chicago and its suburb of Oak Park, Ill., that are at issue in the argument to be heard Tuesday, it could signal that less severe rules or limits on guns are permissible.

The Brady Center to Prevent Gun Violence is urging the court not to do anything that would prevent state and local governments ”from enacting the reasonable laws they desire and need to protect their families and communities from gun violence.”

The new lawsuits were begun almost immediately after the court’s blockbuster ruling in 2008 that struck down the District of Columbia’s handgun ban. In that case, the court ruled for the first time that individuals have a right to keep guns for self-defense and other purposes.

Because the nation’s capital is a federal enclave, that ruling applied only to federal laws.

The challenges to the Chicago area laws, which are strikingly similar to the Washington law, are part of an aggressive push by gun rights proponents in the courts and state legislatures.

Courts are considering many gun laws following the justice’s 2008 decision. Massachusetts’ highest state court is examining the validity of a state law requiring gun owners to lock weapons in their homes.

Two federal appeals courts have raised questions about gun possession convictions of people who previously had been convicted of domestic violence misdemeanors. A suit in Washington challenges the capital’s ban on carrying loaded guns on public streets.

Lawmakers in several states are pushing for proposals favored by the National Rifle Association and other gun rights groups. The Virginia Legislature is considering repealing a law that limits handgun purchases to one a month. That law was enacted in 1993 because Virginia was the No. 1 supplier of guns used in crimes in other states.

A separate proposal in Virginia would allow people with a concealed-weapon permit to take hidden guns into restaurants that sell alcohol, as long as those patrons don’t drink.

Chicago is defending its gun laws at the high court. Mayor Richard Daley said a ruling against his city would spawn even more suits nationwide and lead to more gun violence.

”How many more of our citizens must needlessly die because guns are too easily available in our society?” Daley said at a Washington news conference last week that also included the parents of a Chicago teenager who was shot on a bus as he headed home from school.

Annette Nance-Holt said her only child, 16-year-old Blair Holt, shielded his friend when a gang member boarded a bus and began shooting at rival gang members.

”You might ask, ‘What good is Chicago’s handgun law if so many of our young people are still being shot?’ ” Nance-Holt said. ”All I can say is, imagine how many more would be if the law were not there.”

Gun rights advocates say such killings should serve as reminders that handgun bans and other gun laws do nothing to protect people who obey the law.

Indeed, 76-year-old Otis McDonald said he joined the suit in Chicago because he wants a handgun at home to protect himself from gangs.

The thrust of the legal arguments in the case is over how the Supreme Court might apply the Second Amendment to states and cities.

In earlier cases applying parts of the Bill of Rights to the states, the court has done so by using the due process clause of the 14th Amendment, passed in the wake of the Civil War to ensure the rights of newly freed slaves.

The court also has relied on that same clause — ”no state shall deprive any person of life, liberty or property without due process of law” — in cases that established a woman’s right to an abortion and knocked down state laws against interracial marriage and gay sex.

This is the approach the NRA favors.

But many conservative and legal scholars — as well as the Chicago challengers — want the court to employ another part of the 14th Amendment, forbidding a state to make or enforce any law ”which shall abridge the privileges or immunities of citizens of the United States.”

They argue this clause was intended as a broad guarantee of the civil rights of the former slaves, but that a Supreme Court decision in 1873 effectively blocked its use.

Breathing new life into the ”privileges or immunities” clause might allow for new arguments to shore up other rights, including abortion and property rights, these scholars say.

This approach might enable challenges to arcane state laws that limit economic competition, said Clark M. Neily III of the public interest law firm Institute for Justice.

He pointed to a Louisiana law that protects existing florists by requiring a license before someone can arrange or sell flowers. The licensing exam is graded by florists, he noted.

”No reasonable person thinks that law has a legitimate purpose,” Neily said.

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