Conservative radio host Mark Levin has endorsed Rep. Jeff Landry (R-La.) in his runoff election against Rep. Charles Boustany Jr. (R-La.), a boost to the Tea Party favorite ahead of their early December election.

"I am endorsing Congressman Landry because he is the conservative in this race," Levin said in a statement released by Landry's campaign. "Landry is a proactive conservative, and the other guy is trouble. Landry is a citizen congressman looking out for the folks, and the other guy is all over the map."

Landry's district was dismantled in redistricting, leading the freshman Tea Partier to challenge Boustany in a new district that mostly covers Boustany's old territory.

Boustany, a four-term lawmaker who is an ally of House Speaker John Boehner (R-Ohio), led in the first round of voting with 45 percent to 30 for Landry. But Louisiana's unusual all-party primary system sends the top two finishers to an early December runoff, and turnout is expected to be low, which could boost the more conservative Landry in the heavily Republican district.