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David Plouffe, one of the architects of President Obama's historic 2008 White House victory, endorsed Hillary Clinton Saturday, Obama's rival from that campaign.

"To be honest, during the most intense days of the 2008 primary, I would never have imagined writing this piece," Plouffe, writing his endorsement on Medium. "I doubt Team Clinton felt any differently about me."

"She doesn't quit. And there were times I wish she had! But you have to deeply admire that strength and persistence," Plouffe said. "Americans still need a president who will wake up every day, prepared to overcome any obstacle on their behalf.

Hillary Clinton should — and I believe will — be that president."

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