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 TrumpThe Memo: Biden comes out punching on COVID-19 Ex-Kansas state rep charged with fraud of more than 0K in COVID-19 relief money Medicare trustees sound alarm, but progressives press ahead with irresponsible Medicare expansion 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 ClintonHoward Stern rips vaccine opponents: 'F--- their freedom, I want my freedom to live' New Hampshire Democrat wins GOP-held state House seat Clinton thrilled to have Joan Allen recording her new book MORE and has no plans to attend the Republican convention.