The likely script of the next attack ad. A woman in her later 40s, looking worried at a kitchen table. She's probably vaguely Latino; the photos on her refrigerator (kids, no dad) suggest a single mom.

A woman's voice over. "You've worked hard all your life. You've paid Medicare taxes for almost 30 years. But under the Republican plan, Medicare won't be there for you. Instead of Medicare as it exists now, under the Republican plan you'll get a voucher that will pay as little as half your Medicare costs when you turn 65—and as little as a quarter in your 80s. And all so that millionaires and billionaires can have a huge tax cut."

That ad will draw blood and will—as Henry Kissinger used to say—have the additional merit of being true.