In the last 6 days (only days I have numbers for) there has been no docking of votes against the other team. Unless it was something like 10 votes here and 10 votes there that got buried in data collection.
And yeah if you are not in the US sign up with out putting in address info. You won't get the bonus but there is nothing in their rules about needing to be a US citizen to vote. I have an e-mail out to get verification on this.
This doc seems to have gotten a lot of people voting. The spike in the graph is pretty extreme.