Ryan's message to the elderly:
"Romney's choice of Ryan as his running mate has put a spotlight on the Wisconsin congressman's best-known achievement - a budget plan that would slash Medicare's projected costs by converting it to a program that provides limited subsidies to buy coverage.
But on the campaign trail, Ryan has moved away from his plan to emphasize less contentious proposals by Romney.
Talk of shrinking the health program for the elderly could lose votes in the November 6 election in the hotly contested state of Florida, home to the highest concentration of retirees in the country.
"Their plan would put Medicare on track to be ended as we know it," President Barack Obama said to a crowd of about 2,300 at a campaign event on Saturday in Windham, New Hampshire.
"You'd think they'd avoid talking about Medicare given the fact that both of them have proposed to voucherize the Medicare system. I guess they figure the best defense is to try to go on offense," Obama said.
Polls show Romney and Obama running neck-and-neck in Florida, where the cliffhanger 2000 presidential election was decided.
Republicans accuse Obama of cutting $716 billion from Medicare to pay for the healthcare overhaul law that the Democratic president signed in 2010.
But Ryan's plan also would cut that money from Medicare, even as he proposes repealing the broader healthcare law. Romney says he would keep those funds for Medicare.
Ryan talked on Saturday about his grandmother who had Alzheimer's disease and moved in with him and his mother when he was in high school.
"Medicare was there for our family, for my grandma when we needed it then. And Medicare is there for my mom, when she needs it now. And we have to keep that guarantee," he said.
"But in order to make sure that we can guarantee that promise for my mom's generation, for those baby boomers who are retiring every day, we must reform it for my generation.""