The presidential campaigns duked it out over Medicare Saturday.

Presumptive Republican presidential nominee Mitt Romney's running mate, Paul Ryan, said the GOP will protect retirees and those nearing retirement from Medicare cuts.

Ryan introduced his 78-year-old mother at a Florida retirement community.

He said even though she relies on Medicare, the system needs fixing.

"In order to make sure 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," he said. "To save it for this generation, you have to reform it for my generation so it doesn't go bankrupt when we want to retire."

In New Hampshire, President Barack Obama blasted the GOP ticket.

He claimed their proposed voucher system would leave seniors paying $6,400 more a year for health care.

"That doesn't strengthen Medicare," he said. "That undoes the very guarantee of Medicare. That's the core of the plan written by Congressman Ryan and endorsed by Gov. Romney.''

The president challenged the crowd to ask the Romney campaign to defend its plan. Romney will be in New Hampshire on Monday.