John Foster stepped down from that post last week, citing family as his reason for leaving the job he took less than a year ago.
Foster will continue working for the party through the middle of March. The announcement comes on the heels of the party's most successful caucus to date.
This is the second big change for the state Democratic Party in as many months. Former party chairman Richard Stallings resigned in January. He was replaced by Ketchum attorney Keith Roark.
Switching executive directors seems to be the thing to do in political circles these days. Last week, the Idaho Republican Party announced the appointment of Sid Smith, former spokesman for Sen. Larry Craig, following the unexpected departure of Jayson Ronk.
Smith started his new job this week.