Scott Romney will not run for the open Michigan Senate seat in 2014, according to a state GOP source who spoke with Romney late on Tuesday.

Romney, the brother of the GOP’s 2012 presidential nominee Mitt Romney, would have kicked off the primary in the strongest position in the field, according to a new automated poll released Tuesday by a GOP firm.

But the corporate attorney has decided to forgo a bid for retiring Sen. Carl Levin’s seat. Democrats have an advantage in the race given the state’s electoral history and, barring a top-tier GOP recruit, the party is in a good position to keep the seat.

The list of potential Democratic candidates includes Debbie Dingell, the wife of longtime Rep. John D. Dingell, former Gov. Jennifer Granholm, former Rep. Mark Schauer, Rep. Gary Peters and Rep. Dan Kildee.

On the GOP side, Reps. Mike Rogers and Justin Amash, former GOP Chair Saul Anuzis and former Michigan Secretary of State Terri Lynn Land are mulling runs.

Here’s a rundown of where all the candidates stand on the race.

Scott Romney did not immediately return a request for comment.