Not really. You have 3 lines (plus text messaging) and 4 hours to vote and you have lots of people who had never voted before who voted. They can vote repeatedly. It's easy to rack up millions and millions of votes in that time. You just call, hear the first part of the recording and hang up.
Ya know... I was just thinking, given how easy it is to ballot stuff... wouldn't the most efficient way of voting, if you think it's going to be close, be to call for the other person, and just not hang up right away, but continue to tie up the line so other people can't get through?