Legalizing marijuana is an issue made to order for the Democratic Party. A majority of Americans now supports the idea, and so do two out of three Democrats. Two states have done it, and several more may vote on it in 2016.

The party could put the issue to use against Republicans, who have no desire to be the party of weed. Can you imagine Rick Santorum or Marco Rubio or Paul Ryan endorsing legalization? Even libertarian Rand Paul declines to go that far.