Mark Tiner left Landrieu's office in 2007, accepting a lobbyist position with L-3 Communications, an aerospace and defense contractor. He remained in that role until early 2013. Tiner then volunteered for Gov. Terry McAuliffe's (D-Va.) successful Virginia gubernatorial campaign.
Tiner will work under Landrieu on the Senate Energy and Natural Resources Committee, which she chairs. Tiner's new job may not be safe for long, as he rejoins Landrieu's staff amid a heated reelection battle for the Louisiana Democrat. In a traditionally red state, Landrieu faces serious opposition from Rep. Bill Cassidy (R-La.).
A four-term senator, Landrieu is a friend to Louisiana's sizeable oil industry and is considered one of the most conservative Democrats in the Senate.