Democrat Hillary Rodham Clinton said Tuesday that a mandate requiring every American to purchase health insurance was the only way to achieve universal health care but she rejected the notion of punitive measures to force individuals into the health care system. "At this point, we don't have anything punitive that we have proposed," the presidential candidate said in an interview with The Associated Press. "We're providing incentives and tax credits which we think will be very attractive to the vast majority of Americans." She said she could envision a day when "you have to show proof to your employer that...