Absentee ballot- should I mail it in or drive it over?

[LeftyMom]

Argument for mailing it-
1. It's easier
2. It will only cost me two stamps (yes, we have so many damned ballot initiatives the thing's overwight again)
3. The post office probably can't lose it over such a short distance

Argument for driving it over
1. It's not far
2. I'll know it arrived safely

So far I've worried about this for longer than driving the damn thing to the elections office would take, so I'm going to let you people figure it out for me.