Conflict of tense. Shouldn't it say, " I think. I vote"?
Oh good...I get to expound about something no one is gonna care about

As two sentences it can go either way. I think. I voted. applies to a single election. "I think." implies that thinking is an ongoing action where voted is a single action for this election.
I think. I vote. Implies ongoing action for both. You continue to think and thus you continue to vote when it is time.
I hope that lets everyone sleep a little easier now.

Take care.