Hillary ClintonHillary Diane Rodham ClintonBloomberg called Warren 'scary,' knocked Obama's first term in leaked audio Trump trails Democratic challengers among Catholic voters: poll Sanders under fire from Democrats over praise for Castro regime MORE's neck muscles got a workout during Bernie SandersBernie SandersSanders says idea he can't work with Republicans is 'total nonsense' Sanders defends Castro comments in wake of backlash from some Democrats Sanders releases list of how to pay for his proposals MORE's endorsement speech Tuesday.

Video by Bloomberg showed Clinton nod 406 times during Sanders's speech.

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During his speech, the Vermont senator said Clinton had "won the Democratic nominating process" and congratulated her.

“She will be the Democratic nominee for president, and I intend to do everything I can to make certain she will be the next president of the United States," he said in the address.

"I have come here today not to talk about the past but to focus on the future. That future will be shaped more by what happens on November 8 in voting booths across our nation than by any other event in the world. I have come here to make it as clear as possible as to why I am endorsing Hillary Clinton and why she must become our next president."

Watch all 406 of Clinton's nods in the video above.