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 TrumpForget the spin: Five unrefuted Mueller Report revelations Lara Trump: Merkel admitting migrants 'one of the worst things that ever happened to Germany' Financial satisfaction hits record high: survey 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 ClintonForget the spin: Five unrefuted Mueller Report revelations Former senators launching effort to help Dems win rural votes Biden's announcement was a general election message, says political analyst MORE and has no plans to attend the Republican convention.