Could it be argued that we are no more ‘in the know’ than them though?
My suspicion is that most of the people betting on InTrade are getting their information only from the DNC propaganda system, also known as the mainstream media. If you were to believe those polls, and it's the only information you're getting, of course you'd expect Obama to win handily. The press has already told them that Romney has lost.
I'd say that we here at FR are definitely more 'in the know' than the typical voter/Intrade bettor.