MILWAUKEE (AP) — A new poll shows the race between Republican Gov. Scott Walker and Democratic challenger Mary Burke remains close. The Marquette law school poll released Wednesday says 48 percent of registered voters would vote for Walker and 41 percent support Burke. The margin of error is plus or minus 3.5 percentage points. A Marquette poll conducted in January had nearly the same results. The poll of 801 registered voters was done between March 20 and 23. It is the first poll since the two campaigns started advertising in the governor's race.