This commentary originally appeared on The Hill.
Dear Secretary Clinton:
Like most of the other Bernie Sanders delegates at the national convention last week, I don't trust you. At the same time, we have a common interest in defeating Donald Trump. That ought to be the basis for a tactical alliance during the next 99 days — but you need to make a major course correction.
The problem can't be solved by staying on message and telling your pal Terry McAuliffe to keep quiet. (Have you considered gifting him a vacation to a deserted island for the next hundred days?) He let slip what so many Bernie delegates and supporters around the country already figured — we'd be fools, given your record, to believe that your conversion to oppose the Trans-Pacific Partnership is genuine.
But here's my point: Complacency about getting the votes of people who went for Bernie in the primaries is dangerous, wishful thinking. Many of the same pundits who, two weeks ago, were predicting a Democratic convention of tranquility and unity, are still citing polls that say 85 or 90 percent of Bernie voters will go for you in November. Such assessments are dubious.
You're in danger of a steep falloff of turnout from Bernie's primary voters. And crucially, in swing states, turnout will make all the difference. If an appreciable number of those Bernie voters opt to stay home or vote for a third-party candidate in the fall, here comes President Trump.