A new poll finds former Sen. Russ Feingold (D-WI) beating Sen. Ron Johnson (R-WI) by double digits in the 2016 race for Johnson’s senate seat.

The Marquette University Law School poll released Thursday found that 54 percent of registered voters say they would support Feingold in a 2016 matchup, while 38 percent said they would support Johnson.

Another 9 percent said they weren’t sure who they would support.

Both Republicans and Democrats have suggested that if Feingold were to run against Johnson in 2016, he would pose a strong challenge. Johnson defeated Feingold in 2010. Recently Feingold stepped down at the State Department and people close to him have told TPM he’s gearing up for a rematch.

A month ago, a Public Policy Polling survey found Feingold trouncing Johnson by about 9 points.

The Marquette University Law School poll was conducted among 803 registered voters between April 7 and April 10. It had a margin of error of plus or minus 3.5 percentage points.