Bernie Sanders should know his socialized medicine but in an exchange on Sunday he failed when he was pressed to explain why a single-payer health care system was rejected in Vermont and California, two staunchly Democratic states:CNN host Jake Tapper said that California and Vermont are  cobalt blue states  and asked how single-payer could be affordable at the national level if they rejected the system at the state level because of the expense:Single-payer failed to pass in both California and Vermont after lawmakers were unable to figure out how to fund the system. Voters in Colorado also rejected single-payer last year.Sanders pushed back against Tapper, citing  studies that he has seen,  and said that single-payer would save the average family  significant sums of money. If you look at Canada s single-payer health care system per capita, their costs are far far less than the United States,  Sanders said.   If you look at the UK, if you look at countries around the world, all of which have different approaches to a national health care system, in every instance, they are spending substantially less per capita than we pay in the United States. Read more: WFB