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The Tuesday debate will tee up an an even starker contrast on health care on Wednesday, when former Vice President Joe Biden is again likely to advocate for a more incremental health plan that pulls the party back from its leftward lurch and Sen. Kamala Harris promotes her new twist on Medicare for All. Harris' new plan, which she released on Monday, could upend the dynamics of an issue that's energized Democratic voters — but one that more moderate Democrats worry will hurt the party’s shot at defeating President Donald Trump. (Pradhan and Cancryn, 7/30)

Expect health care to be a big issue, as it was on Night 1. Sen. Kamala Harris of California unveiled her "Medicare for All" plan on Monday, presenting a middle ground between more progressive candidates' stances looking to replace private health insurance and that of Biden, who wants a public option. (Montanaro, 7/31)