IOWA CITY, Iowa—Former Vice President Joe Biden released the names of more than 200 top donors who have raised at least $25,000 for his 2020 campaign, heeding the calls of rivals.

Mr. Biden’s campaign listed the names of 259 top donors, some of whom have raised money for his campaign as a couple, as Massachusetts Sen. Elizabeth Warren has pushed Democratic presidential candidates to provide more transparency in fundraising.

The…

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