Applicants must be between 5'7" and 6'6" and be at least 18 years old. They must also be able to run from center field to home plate -- about 200 yards -- in 40 seconds, and be able to stand wearing a costume that weighs about 45 lbs. for the duration of a game.
The deadline for applications is February 10, and there will be tryouts by invitation only, the team stresses, on February 18. So no wise guys in Millard Fillmore or William Howard Taft costumes need show up uninvited. The Racing Presidents web page is here, including photos. There are also numerous videos of the Racing Presidents racing, such as this one.