The Washington Nationals hold the Presidents Race in the middle of the fourth inning, between giant heads of the four presidents on Mount Rushmore. One running story had been Teddy Roosevelt's losing streak, which finally ended last season.
The Nats today introduced a fifth president for the races--William Howard Taft. As explained here, Taft's size (i.e., girth) and facial hair could make him a fan favorite (although the photos show he is not that much larger than the other president heads. There also is the potential for a fun rivalry, given the political rift between Roosevelt and Taft.
More importantly, every race now can be part of an off-shoot event--Justice Races. No matter how Taft does against the other presidents, he always will be the fastest justice.