Let's take a look at the real numbers in play here. We'll be using this page's poll results and source code.
In total, 1190437 votes were cast in the poll. If you enter in the address bar
you'll see how many votes were cast for one of the four given options. I see that value as 265594. If 265594 votes were cast for the given options, then the remaining 924843 votes were for write-in suggestions.
Now Serenity received 70% of the given votes, or 185916 votes. If Colbert beat Serenity by 40000 votes, then Colbert had about 226000 votes.
How do those numbers stack up? Well, if you do an actual poll, Serenity received 15.6% of the vote, and Colbert received 19%.
At least it's now over until NASA announces their choice in April.
EDIT: Somehow, I missed the part of the AP release stating that Colbert got 230539 votes. OK, I wasn't too far off.