A Supreme Court decision upholding President Barack Obama's health-care law, which compels people to buy medical insurance, would give Congress the power to make Americans purchase any other product, said lawyers challenging the measure. "The next time, it'll be cars," said Paul Clement, a Washington lawyer who represents 26 states that have appealed to the high court. "Some people don't buy cars. They walk." At a debate in Washington today, sponsored by Bloomberg Law and Scotusblog, Clement and a second attorney challenging the law clashed with supporters over the reach of Congress' power to regulate interstate commerce.