D.C. Council member David Grosso (I-At large) told supporters Tuesday night that he is endorsing Democrat Elissa Silverman in the April 23 special election for an at-large council seat.

Grosso, the council’s newest member, made his announcement minutes after former council member Michael A. Brown announced he’s dropping out of the race.

“After much thought and reflection on this critical race, I have determined that Elissa’s qualifications and strong grassroots campaign make her a viable candidate for victory on April 23rd.” Grosso wrote. “I want you to know that voting for Elissa on April 23rd is a vote for transparency, good government and ethics.”

Silverman is a former reporter for the City Paper and the Washington Post who is on leave from the liberal Fiscal Policy Institute.

Though Silverman has been endorsed by some liberal organizations and former council members Kathy Patterson and Sharon Ambrose, Grosso becomes the first sitting council member to get behind her campaign.

Grosso was elected to the council in November after he defeated Brown for one of two at-large seat seats reserved for a non-Democrat. He has attempted to position himself as a reform-minded and progressive leader of the body.

Several other council members, including Jack Evans (D-Ward 2) and Muriel Bowser (D-Ward 4), have announced their support for incumbent Anita Bonds (D) in the at-large race.

But with only the most committed voters expected to show up to the polls, it appears unlikely that endorsements from council members will have a major impact on the race.