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 TrumpCDC updates website to remove dosage guidance on drug touted by Trump Trump says he'd like economy to reopen 'with a big bang' but acknowledges it may be limited Graham backs Trump, vows no money for WHO in next funding bill 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 ClintonTrump, Biden set for tight battle in Florida We need to be 'One America,' the polling says — and the politicians should listen Poll shows Biden with 6-point edge on Trump in Florida MORE and has no plans to attend the Republican convention.