Tim Johnson will decide this month whether to seek reelection

Sen. Tim Johnson will announce “this month” whether he’ll run for a fourth term in the Senate next year.

Johnson, 66, has been rumored by Senate-watchers to be considering retirement. There’s already one Republican candidate for his seat, former Gov. Mike Rounds.

"I will announce my intentions for the 2014 South Dakota Senate race in the coming weeks," Johnson said Thursday Wednesday morning in a press call with South Dakota reporters.

The Democrat said he has “not made up my mind entirely” about whether to seek another term.

If Johnson doesn’t run, one possible Democratic candidate is Johnson’s son, current U.S. Attorney Brendan Johnson. Johnson declined to say whether he’d talked about running with Brendan Johnson.

"You would have to ask him about that," Johnson said. "I haven’t even decided myself about whether to run or not. There are some excellent candidates waiting in the wings if I decide not (to run)."

Another Democrat who is reportedly considering running for Senate if Johnson retires is former Rep. Stephanie Herseth Sandlin.