Democratic Sen. Hillary Rodham Clinton said Friday that her unsuccessful health care reform effort in 1993 makes her more effective on the issue now as she seeks the presidencyThis week, rival John Edwards offered his plan for universal health care that calls for a tax increase to ensure health care coverage for all and a requirement that businesses provide insurance. The tax increase would pay for the plan's cost of up to $120 billion a year."The president can propose, but the Congress has to dispose, and if we don't have a consensus in the country that our present system is...