6 things to watch on night two of CNN's Democratic presidential debate in Detroit

Detroit (CNN)The drama on night two of CNN's presidential debate starts at center stage on Wednesday. In the Democratic debate's first night, the race's two leading progressives, Massachusetts Sen. Elizabeth Warren and Vermont Sen. Bernie Sanders, commanded the stage, beating back attacks from moderates who were clamoring for attention to boost their low-polling campaigns. The dynamics will shift Wednesday, with former Vice President Joe Biden and California Sen. Kamala Harris at center stage and progressive agitators like New York City Mayor Bill de Blasio and Washington Gov. Jay Inslee on the stage's outer edges trying to make their marks. Biden will be sandwiched between his two fiercest critics in the party's 2020 Democratic primary field: Harris and New Jersey Sen. Cory Booker. The two black senators have both sharply criticized Biden over racial issues in recent weeks.