Sanders campaign co-chair endorses Warren to be Biden running mate

What they're saying: Khanna wrote in a tweet thread that Warren has been influential in crafting the HEROES Act, House Democrats' $3 trillion coronavirus relief proposal.

• "In an age of sound bites, effectiveness and leadership still matter most. It simply cannot be overstated how influential @ewarren has been during this crisis and on the best parts of the House HEROES Act," Khanna tweeted.
• Khanna said Warren's input helped get funding for states to implement vote-by-mail elections and an Essential Workers Bill of Rights, among other provisions, into the legislation.
• "She needs to be on the ticket," Khanna wrote.

Worth noting: Some Democrats worry that if Warren is selected as Biden's running mate, it would leave open a Senate seat that would be filled by Massachusetts Gov. Charlie Baker, a Republican.

The big picture: On Wednesday, Biden and Sanders released the names of people they've appointed to joint task forces focused on health care, education, the economy, climate change, criminal justice and immigration.

• Rep. Alexandria Ocasio-Cortez (D-N.Y.) and former Secretary of State John Kerry are among the prominent names.