Elizabeth Warren endorses fellow Democrat Joe Biden for president

Sen. Elizabeth Warren on Wednesday morning formally endorsed fellow Democrat Joe Biden for president.

The endorsement came via tweet. The former 2020 presidential candidate recorded a short online video message and linked to Biden's campaign page, encouraging followers to contribute small-dollar donations.  

Warren's endorsement follows those of Sen. Bernie Sanders, another ex-2020 contender, and former President Barack Obama. 

The Massachusetts senator notably withheld her endorsement from fellow "Medicare for All" backer Sanders following the suspension of her primary campaign.