MADISON, Wis. -- Gov. Jim Doyle leads his Republican challenger by 13 points in a new poll released on Thursday -- a figure that is more than double the lead shown in a survey released earlier this month.

The latest poll, performed by the St. Norbert College Survey Center and paid for both by the college and Wisconsin Public Radio, surveyed 400 likely voters between Oct. 9 and 16. The margin of error was plus or minus 5 percentage points.

The survey had Doyle with 51 percent support and Mark Green with 38 percent. Wisconsin Green Party candidate Nelson Eisman had 1 percent, with 7 percent undecided and 4 percent choosing "other."

A previous poll sponsored by WISC-TV and conducted Oct. 2 through 4 showed that Doyle had a lead of 6 percent.

The St. Norbert results are being questioned by the Green campaign. Spokesman Mike Prentiss said that other recent polling indicates the race to be as close or closer than in the WISC-TV survey.

Prentiss said that as far as he's concerned, it's a dead heat with Green gaining momentum.

On the other side, Doyle campaign spokesman Anson Kaye said that he's pleased that Doyle is leading, but it won't change anything heading into the final weeks of the race.

Here are some other results of the St. Norbert poll:

It shows Democrat Kathleen Falk leading her Republican challenger J.B. Van Hollen 44 percent to 38 percent in the race for attorney general. Another 12 percent were unsure, while 7 percent answered "other."
Fifty-one percent said they would support the proposed constitutional amendment banning gay marriage and civil unions, while 44 percent opposed it. Five percent said that they were unsure, while 1 percent refused to answer.
Fifty percent supported an advisory referendum in support of enacting the death penalty for certain cases, with 45 percent against it. Five percent weren't sure.