Seriously, the answer is simple.
Teddy Roosevelt was the epitome of bad ass in life. The guy ****ing hunted big game, performed calavary charges without the god damn horses, not to mention had a black belt in juijitsu and was a world class boxer. Which any fool stupid enough to attack him probably wouldn't find out because he carried heat even when just walking around the white house. **** this "lawyer into a politician" **** that modern wimps do. He was a god damn cattle rancher and cop who went on to become President. I mean hell, how can you not be a badass with a Bear and a Lion as your pets. His PETS are more badass then most presidents! People bitched about riding 25 miles in training so the 51 year old decides to ride 100 miles straight and tell them STFU. You shoot him? He flicks you off and goes on to give a campaign speech with the bullet wound still dripping blood.
Teddy Roosevelt took ****s more bad ass than 90% of the Presidents we have had.
Zombie Teddy Roosevelt is just taking a badass thing and then multiplying it by a factor of Badass. It just creates more badass.
Zombie Teddy Roosevelt's VP would have to be Zombie Andrew Jackson, and if you had an issue with it he'd duel you, club your head in with his cane, and eat your brains.