It would be a very odd scam if:
a) It rejects 90% + of people who trya nd enter and only accepts credit card details from teh select few - perhaps the scammers don't want everybodies card details
b) it clearly is already populated with the email addresses of people who entered the ballot - just try and enter a random address and you get an entirely different response.
c) the site checks out as OK with McAfee and other protection agencies
d) If it were a scam do you think it would still be around after 4 days?