Today's installment of campaign-related news items from across the country.
* Three sitting U.S. senators -- Delaware's Chris Coons, Pennsylvania's Bob Casey, and Alabama's Doug Jones -- formally endorsed Joe Biden's presidential campaign this morning. As things stand, the former vice president already has more Senate endorsements than any other Democratic presidential hopeful.
* Former President Barack Obama hasn't endorsed anyone in the 2020 race, but through his spokesperson said this morning he "has long said that selecting Joe Biden as his running mate in 2008 was one of the best decisions he ever made." The spokesperson added, "The two forged a special bond over the last 10 years and remain close today."
* NBC News noted this morning that Donald Trump's re-election campaign has not committed, at least not yet, to staying away from materials hacked by foreign adversaries.
* Appearing at the "She the People" forum, Sen. Cory Booker (D-N.J.) and Rep. Eric Swalwell (D-Calif.) both committed to choosing a woman as a running mate if they win the Democratic presidential nomination.
* Speaking of Booker, the New Jersey Democrat late yesterday became the latest Democratic presidential hopeful to release his tax returns, disclosing materials from the last 10 years.
* South Bend Mayor Pete Buttigieg crossed a new threshold yesterday: he picked up his first congressional endorsement. Rep. Don Beyer (D-Va.) announced his support for the Indiana Democrat in a formal statement issued yesterday afternoon.
* And in New Mexico's open U.S. Senate race, Rep. Ben Ray Lujan may appear to be the likely Democratic nominee, but he's not running unopposed for his party's nomination: New Mexico Secretary of State Maggie Toulouse Oliver launched her Senate candidacy yesterday.