DES MOINES, Iowa —

Jackie Norris, a current board member of Des Moines Public Schools, is putting in her bid for a U.S. Senate seat.

Norris previously served as the White House Chief of Staff to First Lady Michelle Obama.

She joins a growing field of contenders looking to challenge Republican incumbent Joni Ernst.

Fellow Democrats Zach Wahls , J.D. Scholten , and Nathan Sage have already launched campaigns.

Ernst has not officially announced her reelection bid. One other Republican, former state Sen. Jim Carlin , is challenging Ernst.

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