A group of progressive senators raised alarm this week over a pernicious outgrowth of the United States’ for-profit healthcare system: medical credit cards. In a letter to the chief executives of Wells Fargo and Synchrony Financial — two large issuers of medical credit cards — Sens. Elizabeth Warren (D-Mass.), Ed Markey (D-Mass.), Bernie Sanders (I-Vt.), Chris Murphy (D-Conn.)…
