Yes, I know a single payer system was voted down in Colorado. I'd prefer that be done on a federal level. A lot of the opposition from the left came from the same viewpoint.
If Gallup can produce a poll that has 58% of Americans in favor of "Replacing the ACA with a federally funded healthcare program providing insurance for all Americans", then I don't know if I'm quite ready to accept the ACA as being the farthest to the left we can get on healthcare (
http://www.gallup.com/poll/191504/majority-support-idea-fed-funded-healthcare-system.aspx).
I know the labels make this whole argument easier, but fuck the labels. Nobody is saying we need to run in to rural Kentucky and plaster their trees with posters about socialism. It's about the policies. We live on a planet where a non insignificant number of people simultaneously hold the views that "the ACA is great for me" and "Obamacare is an unconstitutional disaster." I think there's some room to play around in that headspace.
More polling on American's thoughts on healthcare over the years:
http://www.gallup.com/poll/4708/healthcare-system.aspx