In a radio interview with Hugh Hewitt, Paul Ryan claimed to

 have run a marathon in under three hours.  In his words:  

"Under three, high twos. I had a two hour and fifty-something."

When Runner's World asked for proof, Ryan cited the 

Grandma's Marathon in Duluth, Minnesota in 1990.

According to the official results for that race, Paul

Ryan's time was 4 hours, 1 minute, and 25 seconds. 

It would appear that our Marathon Man is just

another face of Lyin' Ryan.