Senate Democratic Leader Harry ReidHarry ReidWhat if there’s no 'Nuclear Option' in the Senate? Republican failure Senate about to enter 'nuclear option' death spiral MORE has officially endorsed Hillary ClintonHillary Rodham ClintonObama should testify before Senate Intelligence Committee Live coverage: Senate intel holds first public Russia hearing Podesta demands Daily Caller correct article on financial disclosures MORE for president.
Reid is the highest-ranking Democrat to throw his support behind Clinton. The endorsement comes days after she won his home-state caucuses.
Reid was neutral in the Nevada caucuses, but made a key call to the leader of the Culinary Workers Union that was seen as having helped Clinton win an impressive victory in Saturday's caucuses.
Voter turnout at Las Vegas's casinos was impressive in part from the union leader getting his members out to vote, and Clinton roared to a victory in Clark County, which is home to Las Vegas.
“Harry Reid asserted again today ... that he really can change the dynamic of an election in this state,” Ralston said on MSNBC shortly after Clinton’s victory speech.