He's viewed as one of the "super-rich" elite, even though he isnt quite in that category. His company has very liberal policies such as benefits covering same-sex partners and I even believe covering abortion. If this was a "values" election there's some reasons you could find in there.
Plus, Denver has a huge hispanic population now and they probably went 1 and all for Salazar. It's a bad loss for us, but Salazar cant stray too far to the left in this state so it's not as bad as it could have been.
Salazar will be just another Tom Daschle. Presumed Conservative at home and Liberal as all hell in DC.