Joseph R. Biden defeated Sen. Bernard Sanders in the Arizona primary, marking a three-state sweep for the former vice president on Tuesday and giving him what could prove to be an insurmountable lead in the 2020 Democratic presidential race.
Mr. Biden has been a roll since turning his campaign around late last month with a victory in South Carolina.
Since then he has won an overwhelming majority of the contests and has left Mr. Sanders with the narrowest, if any, path to the nomination.
• Seth McLaughlin can be reached at smclaughlin@washingtontimes.com.
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