Senator Bernie Sanders wants to be president—he made that much clear with his energized campaign in 2016. Senator Elizabeth Warren does, too, as several recent moves show. They both have widespread name recognition and share similar political philosophies. Is there room enough in a Democratic primary for the two of them?

That was the premise of a Politico article last week about how the “two progressive behemoths [are] on a collision course in the presidential primary.” Sanders told the outlet that he has not spoken to Warren about their respective ambitions, but added, “I suspect that in the coming weeks and months, there will be discussions.”

Warren and Sanders recognize that they share the same lane in a presidential race: They’re both populists dedicated to fighting economic inequality. Splitting the vote and missing the opportunity to elevate that signature issue in presidential politics would be a worse fate than any extinguished personal ambition.

But Warren and Sanders are hardly identical progressives. They have markedly different approaches to empowering the working class. In the simplest possible terms, Warren wants to organize markets to benefit workers and consumers, while Sanders wants to overhaul those markets, taking the private sector out of it. This divide—and where Warren or Sanders’s putative rivals position themselves on it—will determine the future of the Democratic Party for the next decade or more.

Warren’s suite of policies, rolled out in recent months, all try to reform rules that empower the wealthy at the expense of regular Americans. Her Accountable Capitalism Act would ensure worker representation on corporate boards, and require large corporations to consider all its stakeholders—not just investors but workers, consumers, and communities of interest—in any decision-making. Her climate bill would force public companies to disclose climate-related risks, giving investors more information to use their money toward sustainable goals.