This is the moment when Tim Kaine sold himself as a potential vice president

During the vice presidential debate Tuesday night, there were many moments when the Democratic nominee Tim Kaine appeared nervous and snarky, interrupting his opponent Mike Pence and the moderator Elaine Quijano. On the other hand, Kaine frequently seemed to be better prepared on substance–particularly when Quijano asked the candidates whether America asked too much of its police officers.