The poll shows the candidates for Wisconsin governor tied at 46% among registered voters, with Walker leading 49%-46% among people likely to vote.
Marquette released its survey Wednesday afternoon, two weeks after the last poll. It had given Walker a slight edge with registered voters, while Burke had a slight lead among people who say they're likely to vote.
The latest poll was conducted between Sept. 11 and Sept. 14 and included 800 registered voters.
Five percent of them say they are undecided in the governor's race.
According to pollster Charles Franklin, there continues to be no evidence of a front runner, seven weeks before the election. Walker and Burke have remained in a virtual tie, since May.
In the race for Wisconsin Attorney General, Republican Brad Schimel has closed the gap with Democrat Susan Happ, in the latest Marquette survey. She leads 39%-38% among registered voters. Two weeks ago, Happ lead Schimel by 7 points. At that time, 24% of the respondents were undecided; the number has fallen to 20%. The AG's race also remains within the poll's margin of error.
