For progressives of any stripe, Medicare has to be a bright, hot line. One of the great triumphs of progressive government in the 20th century was its virtual elimination of hopeless poverty among the elderly. Because of Medicare, and Social Security before that, old people were freed up to have the opportunity to consider their quality of life, rather than living from one can of catfood to another. And there was no more shame in them than there was in young Paul Ryan when he was living off Social Security survivor benefits after the death of his father. (You’re welcome, by the way.) There can be no backsliding on this one, no attempts to “work across the aisle,” no appeals to “civility” or “bipartisanship.” Loyalty to Medicare has to be a defining characteristic of a Democratic politician and any Democratic politician who doesn’t like it deserves to be primaried out of office.