A straw poll at ColoradoPols shows support for Graves. I have no idea how representative that straw poll is of the "electorate" in this case, but I'm guessing not too many people outside of that group would care to register such an opinion. Also, I'm pretty sure all the candidates were Obama backers last year, so we don't have that interesting angle to examine.
This is a safe Democratic district. A small number of people tonight will be picking someone who could theoretically serve until 2019. Fun stuff!