Catherine Rampell: A winning theme for Democrats? Kids.

Democrats have been casting about for a winning theme this November. Here’s one suggestion: kids.After all, despite once declaring themselves the party of family values, Republican politicians have more recently ceded this territory. The GOP is now the party of state-sanctioned child abuse, of taking health care away from poor children, of leaving young immigrant “Dreamers” in legal limbo.It is GOP policy, and GOP policy alone, that has ripped thousands of immigrant children fr