I was in the same boat PotatoBoy, though of course electoral college votes seems obvious when you see it. I just saw your comment on the previous challenge as well. I'm sure you'll get another couple of solves soon and put the pressure on me again!
I got it. The answer is New Jersey. 13 numbers = 13 colonies, and the numbers are how many electoral votes each state has. In alphabetical order, it's missing 14 between 4 and 29, for New Jersey's 14 electoral votes.
Congratulations 'sonofapollo'....... you explained the challenge very well. Your 'Honorary Gold Medal' is on the way :o) ........ congratulations again!
Fitting time for this, right after a US election.