I just heard that Polleverywhere will update with votes sent through Twitter! It is easy to implement and doubles the options for live voting (along with texting) when using Polleverywhere for presentations.
The screen shot below shows how easy it is to include Twitter voting in your poll. Simply click on "New Tweets to @poll" and you are done.
Once the poll is complete, the twitter option will appear at the top of the poll. Audience members who want to vote through twitter will be prompted to send a message to @poll (insert poll number here) The screen shot below shows a sample response sent through twitter.