Landrieu lost her bid for a fourth term in the Senate last fall to Republican Bill Cassidy. She has owned a home for many years in Washington, where her husband is a real-estate agent.

Landrieu, who cannot work as an actual lobbyist until January 2017 under federal rules, joins several other former Louisiana members of Congress in the ranks of Washington’s professional persuaders, including John Breaux, another Democratic ex-senator, and Bob Livingston and Billy Tauzin, bothRepublican ex-congressmen.

Landrieu earlier this spring also accepted a position as a consultant to the Walton Family Foundation, a charitable organization of the family that made its fortune on Wal-Mart stores.