Senate Majority Leader Harry ReidHarry ReidFree speech is a right, not a political weapon Overnight Tech: FCC eyes cybersecurity role | More trouble for spectrum auction | Google seeks 'conservative outreach' director Cures bill clears first Senate hurdle MORE (D-Nev.) endorsed Sen. Kirsten GillibrandKirsten GillibrandGOP chairman: Spending bill expected to last through April Vet groups applaud Trump's Defense pick of Mattis Dem lawmaker won't support waiver allowing Mattis to serve as defense secretary MORE (D-N.Y.) on Friday, giving her first reelection bid a boost as she heads toward a primary with Rep. Carolyn Maloney (D).

In a statement, Reid called Gillibrand a "rising star" in the Democratic caucus.

"As a working mother with two young children, Kirsten brings unique perspective to the challenging issues we are debating in Congress," Reid said. "In just six months, Kirsten has introduced a number of new and innovative legislative approaches to the problems many families face."

Reid's endorsement comes as Gillibrand blew Maloney away in fundraising for the second quarter. Recent polling, though, shows Maloney holding a slight lead over Gillibrand in the primary.