Don't want to count our chickens before they hatch, but this Marquette poll rating is good news for Russ

Source:  FiveThirtyEight pollster ratings, 6/2/2016 (highlights added)

Since August 2015, Russ Feingold has gained 3.7 percentage points, while Ron Johnson has lost 0.1.

At this point, the March 2016 results appears to be an outlier.