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 John TrumpDemocrat calls on White House to withdraw ambassador to Belarus nominee TikTok collected data from mobile devices to track Android users: report Peterson wins Minnesota House primary in crucial swing district 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 ClintonNAACP seeks to boost Black voter turnout in six states California Dems back Yang after he expresses disappointment over initial DNC lineup The Hill's Campaign Report: Biden picks Harris as running mate MORE and has no plans to attend the Republican convention.