Democrats’ divisions test Biden’s front-runner strength

Former Vice President Joe Biden listens as Sen. Kamala Harris, D-Calif., speaks during the second of two Democratic presidential primary debates hosted by CNN Wednesday, July 31, 2019, in the Fox Theatre in Detroit. (AP Photo/Paul Sancya)

Rep. Tulsi Gabbard, D-Hawaii, is interviewed by 10-year-old Jeffrey Kraft after the second of two Democratic presidential primary debates hosted by CNN Wednesday, July 31, 2019, in the Fox Theatre in Detroit. (AP Photo/Carlos Osorio)

DETROIT — The ideological divisions gripping the Democratic Party intensified Wednesday as presidential candidates waged an acrimonious battle over health care, immigration and race that tested the strength of early front-runner Joe Biden’s candidacy.