Little bit of a head scratcher in Wisconsin today:
The U.S. Senate race in Wisconsin has tightened to its narrowest lead to date in the Marquette Law School Poll for former Democratic Sen. Russ Feingold over incumbent Republican Sen. Ron Johnson.
Feingold led Johnson 46-44 among likely voters. Libertarian candidate Phil Anderson received 4 percent support.
Johnson has trailed in every publicly available poll tracked by Real Clear Politics dating back to February 2015 with the exception of a Loras College poll released last week that showed him five points ahead of Democratic challenger Russ Feingold.
Two other national polls last week showed Feingold leading by margins of 3 points and 12 points.
The Loras College poll included 500 likely voters whereas the Gravis poll that strongly favored Feingold included 1,102 registered voters. The CBS News/YouGov poll included 993 likely voters.
The previous Marquette poll showed Johnson down six points, which was a poorer showing than GOP presidential nominee Donald Trump at the time, who was trailing Democrat Hillary Clinton by three points in a four-way race. That poll was taken just before the first presidential debate.
The latest Marquette poll was in the field as videos surfaced Friday showing Trump's lewd and predatory 2005 comments about women. Since then he and Clinton met for the second time in a presidential debate and Trump has gone on the offensive against Republican defectors, including House Speaker Paul Ryan of Janesville.
It remains unclear what impact, if any, Trump's troubles are having on the U.S. Senate race.