I see your point, but respectfully disagree.
if you think of this as a team effort than I think it does make sense, other wise, why go to a baseball, basketball, football, hockey match and root on your team?
There's all sorts of situations people are in life-wise that may make it hard for them and they do need encouragement to give their all if they're going to get to their polling place.
Some of these races are razor tight and people need encouragement.