Charles Bass WaPo oped:

Addressing hundreds of supporters while campaigning in Keene, N.H., last month, Sen. Bernie Sanders (I-Vt.) declared: “Let me tell you a secret: We’re going to win New Hampshire!”

He has some reason to feel confident, given that a new poll put him just 10 percentage points behind front-runner Hillary Clinton in the Democratic presidential primary in the Granite State. But before he pops the champagne corks, I have a secret of my own to share with the senator: He may not qualify for the New Hampshire ballot as a Democrat.