TOPEKA, Kan. (AP) - A new poll says the race in Kansas between Republican incumbent Governor Sam Brownback and Democratic challenger Paul Davis is a toss-up. The poll, released this week by NBC and Marist College, showed Davis as the choice of 44 percent of the 636 likely voters surveyed. Brownback was the choice of 43 percent. Libertarian candidate Keen Umbehr polled at 4 percent, and 7 percent were undecided. The poll was conducted from Sept. 27 to Oct. 1 and had a 3.9 percent margin of error. Nearly 1,100 registered voters were surveyed about how they viewed Brownback. Fifty-one percent said they disapproved of the job he's doing as governor, while 40 percent approved. The margin of error for the question was 3 percent.