Sen. Dianne Feinstein endorsed former Vice President Joe Biden for president Tuesday, making official what the California Democrat has been hinting at for months. 

Feinstein, who served with Biden in the Senate for years, praised the former vice president, saying she’s had a first-person perspective of his political capabilities and specifically citing his support for gun control measures.

{mosads}“I’ve worked closely with Vice President Biden and I’ve seen firsthand his legislative ability, his statesmanship, and most importantly his moral fortitude,” Feinstein said in a statement Tuesday. “During his time in Congress and in the White House, Joe Biden has been a tireless fighter for hardworking American families.” 

The California Democrat added that she believes Biden can “deliver real solutions” in a Congress “dominated by ideological polarization.”

The endorsement, which notably did not go to fellow California Sen. Kamala Harris (D), is far from a surprise. Feinstein has released statements praising Biden for months and hosted a fundraiser for him at her San Francisco home last week.

But it comes amid uncertainty for Biden’s campaign as the former vice president sees Sen. Elizabeth Warren (D-Mass.) surpass him in a handful of national and statewide polls.

A recent poll by the nonpartisan Public Policy Institute of California showed Biden in a virtual three-way tie with Warren and Sen. Bernie Sanders (I-Vt.) in the Golden State.