Join a GOTV phone bank team, even in some other state. Pick a district you think can be turned and make the calls. In your own district or in a neighboring district, sign up for door-to-door canvassing. If your district is a solid winner for a Democrat, find a nearby one that's not and volunteer in it to help the GOTV and canvassing efforts.
Start early. Volunteer on campaigns and on other efforts and keep at it through election day.
Oh my God, that sounds like sooooo much work. Travelling with personal gas money and car! Pounding the pavement too! Might be cold then too, what with Fall.
Since the teabaggers have dwindled down to just a handful of insane people, why bother with a GOTV campaign? Wholly unnecessary. Fire up the bong.