With an earnest look full of concern, U.S. Sen. Marco Rubio is warning television viewers in Florida that the nation must transform Medicare in order to save it, saying it's "the least we can do" for the sake of older people like his 81-year-old mother.
The Florida senator's Medicare ad is designed to sell Republican presidential candidate Mitt Romney's plan to cut the popular program and turn it into a voucher-like system.
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