Rep. Rodney Alexander, the dean of Louisiana’s House delegation, announced Tuesday he won’t seek a seventh term next year, saying Capitol Hill’s partisan gridlock has made it difficult to govern.

“Rather than producing tangible solutions to better this nation, partisan posturing has created a legislative standstill. Unfortunately, I do not foresee this environment to change anytime soon,” the Republican said in a statement issued by his office.

“I have decided not to seek reelection, so that another may put forth ideas on how to break through the gridlock and bring about positive change for our country.”

He is the third House Republican to announce retirement this Congress,  joined by Reps. Michele Bachmann of Minnesota and John Campbell of California.

Alexander, 66, who represents Alexandria and Monroe in southern Louisiana, was first elected to the House in 2002 as a Democrat but successfully ran for reelection two years later as a Republican. He easily won a sixth term in office last year with 78 percent of the vote.

Only Sen. Mary Landrieu, D-La., who was first elected in 1996, has more seniority among Louisiana’s nine-member congressional delegation.

Alexander is a member of the powerful House Appropriations Committee, chairing its subcommittee on legislative branch issues. He said he will serve out the rest of his term, which expires in January 2015.