Democrat Russ Feingold leads incumbent Republican Ron Johnson by nine points among likely voters in the Wisconsin Senate race, according to a poll by the Marquette Law School released Wednesday.

The poll showed that Feingold had 51 percent support among likely voters for November’s election, while Johnson had 42 percent support.

In March, the Marquette Law School poll found Feingold leading Johnson 48 percent to 45 percent among likely voters.

The latest survey showed that two percent said they would support neither candidate while five percent were unsure who they would support at this point.

In March, a poll from the Marquette Law School showed that Feingold had 48 percent of support from likely voters and Johnson had 45 percent.

The poll was conducted from June 9-12 among 666 likely voters with a margin of error of 4.9 percentage points.

Correction: This post originally included an erroneous reference to Feingold and Johnson’s support among likely voters in their respective parties.