A: Mark Sanford, but not for the reasons you're thinking...
According to Roll Call, a scheduling kerfuffle meant that the South Carolina Republican's gym workout was cut short as he (literally) sprinted to vote on an appropriations bill:
NRO's Andrew Johnson highlights the goof:
Sanford walked into the Speaker’s Lobby outside the House chamber in a sweaty T-shirt, gym shorts, and a pair of sneakers upon hearing that votes on the Department of Defense appropriations bill had been moved up an hour, according to Roll Call. In a feeble attempt to comply with dress protocol, Sanford had to borrow an aide’s blazer to sneak onto the floor to cast votes before hovering in the lobby. Sanford nixed Florida congressman Trey Radel’s suggestion to pull his shorts lower so that they would look more like pants.