Democratic state Sen. Kelda Roys of Madison said she will fight back against “extremists” as she launched her campaign for governor Monday morning. Roys, 46, is now the fourth candidate to enter the open Democratic primary. Roys said her experience in the Legislature would help inform the way she would lead as governor. “Much to my chagrin, when you look at the governors who have been effective at cementing their legacies into the law, it’s the governors that have come from the Legislature,” Roys said. Roys, who voted against the recent state budget, said she did so in part because of the lack of education funding.