The poll is a big swing from previous results from the survey, which had Romney within 1 point in mid-October. It's unlikely the race has swung that dramatically in the two weeks since the last poll was released, as national polling has shown a relatively stable race during that period.

Rep. Tammy BaldwinTammy Suzanne BaldwinControversial Trump judicial nominee withdraws Election Countdown: Senate, House Dems build cash advantage | 2020 Dems slam Trump over Putin presser | Trump has M in war chest | Republican blasts parents for donating to rival | Ocasio-Cortez, Sanders to campaign in Kansas Senate Dems build huge cash edge in battlegrounds MORE (D-Wis.) leads former Wisconsin Gov. Tommy Thompson (R) by 4 points in the state's hard-fought Senate race, according to the poll. She's up 47 percent to 43 percent. Other recent polls have shown the race within the margin of error.

There has been little recent public polling of the state, though a poll from the conservative Rasmussen Reports released earlier this week had the race tied. Two nonpartisan, mid-October polls had Obama leading by 2 and 6 points.

The poll of 1,243 likely voters was conducted from Oct. 25-28 and has a margin of error of plus or minus 2.8 percentage points.