Dick Lugar's long tenure in the Senate will soon end, and John Kerry isn't happy about it.

Indiana Sen. Dick Lugar, among the longest-serving Republicans in U.S. Senate history, on Tuesday lost his reelection primary to tea-party-backed state Treasurer Richard Mourdock. With Lugar's exit in January, the Senate will lose one of its few remaining members with a habit of working across the aisle.

Sen. Kerry, D-Mass., has worked with Lugar on the Senate Foreign Relations Committee, currently as its Democratic chairman while Lugar served as its ranking member. Lugar is a well-established Republican voice on foreign policy, having coauthored the seminal Nunn-Lugar nuclear nonproliferation legislation.

Kerry lamented Lugar's defeat in a lengthy statement released to press Tuesday night.