The presidential race hasn’t turned into the great Medicare policy debate that many pundits were expecting, but Medicare is still gaining ground as one of the most important issues of 2012.

President Obama leaned into the issue over the weekend, telling voters in Florida that Mitt Romney and Paul Ryan’s plan would cause seniors’ costs to skyrocket.

Obama was citing a report from the Center for American Progress Action Fund, and the study’s authors provided some backup Monday. The report, by Harvard University Professor David Cutler, who advised Obama’s 2008 campaign, says seniors retiring in 2023 would pay $59,500 more under Romney and Ryan’s plan.