Sen. Ron Johnson is targeting his opponent's ties to Washington.
Alexander Bolton 09/06/16 12:01 AM EDT
The race for the seat pits two Democrats against each other.
Sen. Richard Burr's reelection fight against Democrat Deborah Ross is tighter than expected.
The Arizona senator doesn't mention Donald Trump in the video.
It's in contrast with another Wednesday poll that showed Feingold up by double digits.
Feingold has 54 percent to Johnson’s 41 percent.
Democrat Katie McGinty is vying to unseat GOP Sen. Pat Toomey.
Rubio and Murphy will square off after winning their respective primaries Tuesday night.
Democrat Katie McGinty has led incumbent Sen. Pat Toomey in most of the recent polls.