MADISON, Wis. (AP) – The Republican Governors Association says Democrat Mary Burke’s comments criticizing Gov. Scott Walker on the issue of campaigning while on state time can’t be taken seriously. RGA spokesman Jon Thompson said Tuesday that Burke’s attacks aren’t valid because her campaign employs someone who was convicted of illegally soliciting campaign donations on state time. Tanya Bjork works as Burke’s political adviser. She was convicted in 2005 of misdemeanors for campaigning on state time and trying to cover it up while working for a Democratic state senator. Burke on Monday said Walker set a “low bar for campaign ethics and as governor” given an investigation into aides and associates of his when he was Milwaukee County executive. His deputy chief of staff was convicted of misconduct in office for illegal campaign work.