Many of the left’s policy proposals come with the same design flaw: While sounding great on paper, they have little chance of working in practice. Monday brought one such type of reality check to Sen. Bernie Sanders (I-VT) and supporters of single-payer health care, in the form of the annual Medicare trustees report. The report once again demonstrates Medicare’s shaky financial standing, as the retirement of 10,000 Baby Boomers every day continues to tax the program’s limited resources. So why would Sanders and Democrats raid this precariously funded program to finance their government takeover of health care?