Recently, Rep. Conyers admitted that Obamacare was a platform to a single payer system (despite claims to the contrary during the debate).
http://www.singlepayeraction.org/blog/?p=2758“Had that bill (Obamacare) failed, with all of its flaws, it would have taken another decade or longer to get single payer up and going. We view the health care reform bill as a platform on which we are now able to move forward.”
In a search on the net, there are definitely people who advocate and support it in the US.
Would you like to see single payer health care in the US?