So call them. IM them. Text message them. Email them. Leave them a comment. They'll appreciate hearing from you. And ask them to contact their friends too. It's simple, quick, and viral.
So, if you haven't voted, VOTE. Now. If you have voted, contact your friends, and get them to VOTE now... or get them to contact their friends too.
Calls, IMs, texting, email, comments... it's all good!