As much as the Warren program has mobilized many Democratic primary voters, polls show that significant numbers of swing voters — wavering Republicans repelled by President Trump and moderate to conservative Democrats — do not share Warren’s appetite for major structural change, preferring incremental change and the repair of existing programs, like Obamacare.

Strategically, if Warren wins the Democratic nomination, the election would become not only a referendum on Trump — favorable terrain for Democrats — but also a referendum on Warren’s program, a far less certain proposition.

A presidential campaign based on the set of proposals Warren has put forward faces not only an assault from the right, but a mixed reception from the extensive network of Democratic policy mavens, including a number of economists.