Paul Ryan in Roanoke. (AP)

Marquette University finds President Obama leading Mitt Romney in Wisconsin 49 to 46 percent. A month ago, it was 50 to 45 percent.

Fifty-one percent of respondents rate the choice of Paul Ryan for vice president as "excellent" or "pretty good."

“The two-point shift in Romney’s direction is within the margin of error for the poll but suggests Ryan’s addition to the ticket may have slightly increased Romney’s chances in Wisconsin,” said pollster Charles Franklin.

Public Policy Polling found evidence of a Ryan bounce in the state earlier this week.

In the Wisconsin Senate race, Marquette has former governor Tommy Thompson (R) now leading Rep. Tammy Baldwin (D) by 9 points.