Democratic presidential candidates US. Sen. Bernie Sanders, left, I-Vt. and Sen. Elizabeth Warren, right, D-Mass., shake hands as U.S. Rep. Tulsi Gabbard, center, D-Hawaii, watches at a Martin Luther King Jr. Day services at Zion Baptist Church, Monday, Jan. 20, 2020, in Columbia, S.C. (AP Photo/Meg Kinnard)
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