Democratic presidential candidate Sen. Elizabeth Warren (Mass.) attended an American Federation of Teachers town hall on Monday in Philadelphia. (Matt Rourke/AP) May 16 at 12:55 PM

One promised to spend $315 billion to raise teachers’ pay. Another vowed to hire a former public school teacher as U.S. education secretary. A number of them want to eliminate tuition at public schools and forgive a mountain of student loans.

They are the Democratic candidates seeking their party’s 2020 presidential nomination, and education is a hot topic among a good number of them in the field of 23. It is also potential trouble for some candidates whose past positions, once dominant in the party, have been losing

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