In a 5-4 split won by the court's liberals, it ruled that smokers may use state consumer protection laws to sue cigarette makers for the way they promote "light" and "low tar" brands.

The decision was at odds with recent anti-consumer rulings that limited state regulation of business in favor of federal power.

Altria Group Inc. argued on behalf of its Philip Morris USA subsidiary that the lawsuits are barred by the federal cigarette labeling law, which forbids states from regulating any aspect of cigarette advertising that involves smoking and health.

Justice John Paul Stevens, however, said in his majority opinion that the labeling law does not shield the companies from state laws against deceptive practices. The decision forces tobacco companies to defend dozens of suits filed by smokers in Maine, where the case originated, and across the country.

Lautenberg spokesman Scott Mulhauser says the senator was an investor in Madoff's investment fund — primarily in the form of the Lautenberg family's charitable foundation.

The 70-year-old Madoff was arrested Thursday in what prosecutors say was a $50 billion scheme by the Wall Street veteran to defraud investors.

Lautenberg is among a growing roster of potential victims. Those who have acknowledged potential losses so far include former Philadelphia Eagles owner Norman Braman, New York Mets owner Fred Wilpon and J. Ezra Merkin, the chairman of GMAC Financial Services, among others.

The justices did not comment Monday in turning down Hatfill's appeal of a unanimous ruling by the 4th U.S. Circuit Court of Appeals, based in Richmond, Va. A three-judge panel affirmed a lower court's dismissal of the libel claims on the grounds that Hatfill is a public figure and failed to prove that columns written by Nicholas Kristof were malicious.

Circumstantial evidence led the FBI to suspect Hatfill was involved in the anthrax attacks that killed five people and sickened 17 just weeks after the Sept. 11 terrorist attacks. Then-Attorney General John Ashcroft publicly identified Hatfill, who worked at the Army's infectious diseases laboratory at Ft. Detrick, Md., from 1997 to 1999, as a "person of interest" in the investigation.

In June, the Justice Department agreed to pay Hatfill $5.8 million to settle a lawsuit claiming officials violated his privacy rights by speaking with reporters about the case.

No one has been charged in the attacks, although the government now believes another Army scientist, Bruce Ivins, was responsible. Ivins killed himself in July.

The roster of potential victims in what prosecutors said was a $50 billion Ponzi scheme has grown exponentially longer in the past few days.

Madoff, 70, said in regulatory filings that he only had around 25 clients, but it has become apparent that the list of people who lost money may number in the hundreds or even thousands.

Among those who have acknowledged potential losses so far: Former Philadelphia Eagles owner Norman Braman, New York Mets owner Fred Wilpon and J. Ezra Merkin, the chairman of GMAC Financial Services.

A charity in Massachusetts that supports Jewish programs, the Robert I. Lappin Charitable Foundation, said it had invested its entire $8 million endowment with Madoff. The organization's executive director said she doesn't expect it to survive.

Other institutions that believed they had lost millions included The North Shore-Long Island Jewish Health System and the Texas-based Julian J. Levitt Foundation.

Hedge funds and other investment groups looked like big losers too. The Fairfield Greenwich Group said it had some $7.5 billion in investments linked to Madoff. A private Swiss bank, Banque Benedict Hentsch Fairfield Partners SA, said it had $47.5 million worth of client assets at risk.