A new poll suggests Clinton still lags far behind Bernie Sanders among voters 30 and younger.
The Vermont senator's endorsement is the conclusion to the long, surprising Democratic primary fight. Clinton praised Sanders, and Sanders returned the favor, saying it was important to elect Clinton.
Democratic sources familiar with negotiations between the campaigns say a formal endorsement is expected.
How weird has the 2016 election been? Let us count the ways...
Sanders said Friday morning he will vote for Hillary Clinton in November because beating Donald Trump is most important. But he said he's focused on the Democratic Party platform.
Bernie Sanders has raised at least $209 million from small donors online while shunning big money players. Now, Democrats hope Sanders will share his fundraising list with down-ballot candidates.
The results in the nation's capital bring to a close her fight with Vermont Sen. Bernie Sanders. The two met for about 90 minutes Tuesday in what both campaigns called a "positive discussion."
Lucy Flores was among the first endorsements Sanders made earlier this year, and his fundraising plea helped the former Nevada legislator raise over $600,000 for her competitive Democratic primary.
Clinton said she is looking forward to working with Bernie Sanders "during the campaign and then after the inauguration," as the rivals figure out how to unify.