Rep. Paul Ryan (R-Wis.) is out with his fifth ad to defend his House seat in Wisconsin's 1st Congressional District, even as he simultaneously runs for vice president.

The latest ad is on the topic of Medicare, with Ryan telling a group of seniors that the Republican "solution to save Medicare makes no changes for people fifty-five or older."

"But Medicare is going bankrupt," he adds. "To save it, our solution empowers future seniors to choose from a list of guaranteed options, including traditional Medicare. We protect and strengthen Medicare with affordable choices and additional support for those in need. We need to guarantee the promise of Medicare for you and your kids."

Watch:



Changing Medicare has become one of Ryan's signature issues -- and the one that Democrats most frequently attack him on. His 2011 budget blueprint called for turning traditional Medicare into a voucher-based system. Since then, Ryan amended his proposal to include traditional Medicare coverage as an option.

Under Wisconsin law, Ryan is allowed to run for both vice president and member of the House of Representatives. If Ryan and Romney were to win in November, and Ryan was also reelected to the House, the state would have a special election to fill his House seat.

Ryan's Democratic opponent in the 1st Congressional District, Rob Zerban, is still considered a long shot to win the seat. Ryan won reelection easily in 2010, when Tea Party candidates nationwide swept House races.

On Friday, Zerban released an ad attacking Ryan's budget plan, saying it "ends Medicare."

Joe Biden also ran for reelection to the Senate in Delaware when he was running for vice president in 2008, and ran a minute-long ad for his Senate race.

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