Mitt Romney has 39 days to turn his presidential campaign into a winner, but the support of a key voting group is in jeopardy.

Seniors, aged 65 and older, tend to vote Republican, but many are concerned about what a "President" Romney might do with Medicare.

A poll of key swing state by the Washington Post shows Governor Romney trailing in Ohio, Virginia, and Florida.

In Florida, where nearly 1 in 3 voters is over 65, Romney trails President Obama by 4 points, 51 percent to 47 percent.

In both Virginia and Ohio, Mitt Romney is trailing by 8 points, 52 percent to 44 percent.

In those 3 states, voters who said Medicare is extremely important to how they will vote: 59 percent are going with President Obama; 36 percent are with Mitt Romney.

A week ago at an AARP convention in New Orleans, Vice Presidential candidate, Paul Ryan spoke to a group of seniors about Medicare.

"The first step to a stronger Medicare is to repeal Obamacare because it represents the worst of both worlds," Ryan told the audience.

What he wasn't prepared for were the audible 'boos' that were heard as he made his remarks.

The frosty reaction is borne out in new polling data by both CBS News and others which found more people believed the president would do a better job handling Medicare than Governor Romney.