Clinton VP runners-up praise Kaine
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As Hillary ClintonHillary Diane Rodham ClintonPoll shows Biden, Warren tied with Trump in Arizona The Hill's Morning Report - Trump touts new immigration policy, backtracks on tax cuts Hickenlooper announces Senate bid MORE announced that she had picked Virginia Sen. Tim KaineTimothy (Tim) Michael KaineA lesson of the Trump, Tlaib, Omar, Netanyahu affair Warren's pledge to avoid first nuclear strike sparks intense pushback Almost three-quarters say minimum age to buy tobacco should be 21: Gallup MORE as her running mate choice, two of previous contenders for the spot praised the pick.

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New Jersey Sen. Cory Booker and Secretary of Housing and Development Julian Castro took to Twitter Friday evening to show their support for Kaine.

Booker's tweet declaring "Kaine is able" actually beat Clinton to the punch, going out two minutes before the official confirmation from her account.