While Bernie Sanders was doing a brilliant job of ripping into the Trans-Pacific Partnership during the livestreamed launch of the Our Revolution organization on Wednesday night, CNN was airing a phone interview with Hillary Clinton and MSNBC was interviewing Donald Trump’s campaign manager.

That sums up the contrast between the enduring value of the Bernie campaign and the corporate media’s fixation on the political establishment. Fortunately, Our Revolution won’t depend on mainline media. That said, the group’s debut foreshadowed not only great potential but also real pitfalls.

Even the best election campaigns aren’t really “movements.” Ideally, campaigns strengthen movements and vice versa. As Bernie has often pointed out, essential changes don’t come from Congress simply because of who has been elected; those changes depend on strong grassroots pressure for the long haul.

It’s all to the good that Our Revolution is encouraging progressives around the country to plan far ahead for effective electoral races, whether for school board, city council, state legislature or Congress. Too many progressives have treated election campaigns as impulse items, like candy bars in a checkout line.

Opportunities await for campaigns that might be well-funded much as Bernie’s presidential race was funded, from many small online donations. But except for presidential races, the politics of elections are overwhelmingly local—and therein lies a hazard for Our Revolution.