Secretary of State Hillary Clinton

John Edwards is attacking Hillary Clinton on health care. He argues that her approach isn't sufficiently confrontational, that she'd be too friendly to the insurance industry and thus couldn't deliver on the priority Democratic primary voters care about most: universal health coverage. This is the sort of attack Hillary Clinton loves.

The Democratic front-runner's biggest problem is that she's a polarizing figure who'd face deeper-than-usual opposition from Republicans and conservatives in a general election. So long as she's not hobbled in Democratic primaries, getting slammed from the left for being too conciliatory can only help with that problem.