Hillary Clinton's coronation at the Democratic national convention is likely but not a foregone conclusion. Since the superdelegates won't vote until July, and neither she nor Bernie Sanders will arrive in Cleveland with the requisite number of pledged delegates to clinch the nomination, there is still the possibility that the party bosses will see sense, internalize the polls that show she's weaker than him against Trump, and push the superdelegates to support the populist senator from Vermont.

But sense is in short supply in American politics, especially this year. So I'm preparing for the worst: Hillary versus Trump.

It's one hell of a choice. The more I delve into Donald Trump and his past (to research my biography, which comes out in June), the more scared I get. Nevertheless, there is no way I'll vote for Hillary. I won't vote for her if she stops shaking down rich right-wing Republicans for donations. I won't vote for her if she adopts Bernie's platform. I won't vote for her if she names Bernie her vice president. I won't even vote for her if Bernie invites me to spend the summer with him and Jane in Vermont.