Former Florida Gov. Jeb Bush's three delegates at the Republican National Convention cost him and his campaign about $50 million each. 

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Bush, who ended his presidential campaign in February after a poor showing in the South Carolina primary, had only three delegates vote for him at the Republicans' nominating convention Tuesday. His campaign and super-PAC spent $46 million for each delegate, according to The Washington Post's Dave Weigel.

He was a favorite going into the primary season and had substantial financial backing from his family network, but he was unable to muster the enthusiasm his campaign needed.

Donald TrumpDonald TrumpProject Veritas surveilled government officials to expose anti-Trump sentiments: report Cheney: Fox News has 'a particular obligation' to refute election fraud claims The Memo: What now for anti-Trump Republicans? MORE's attacks on Bush as “low energy” resonated with GOP voters and hurt the former Florida governor, who struggled to compete with the business mogul and GOP presidential nominee.

Bush has said he won't vote for either Trump or presumptive Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonHillary Clinton to speak at Asian Americans and Pacific Islanders summit More than half of eligible Latinos voted in 2020, setting record Fox News signs Trey Gowdy, Dan Bongino for new shows MORE and has no plans to attend the Republican convention.