"Oh, you are that guy that didnt vote on me last time we cleared this dungeon! Explain to me why I shouldnt leave right now and queue up with another group in 2 min because I am a tank."
"Vote for me or you go to blacklist"
"Vote for me or I'll wipe us right now"
"Vote for me or I will need on the weapon (although I already have got a far better one equipped)"
Bots voting on each other (easily done: the bots spit out an ID string that the other bots understand)

I am predicting that we will see these things happen pretty fast. I'm not psychic, but I'm not naive neither.