BROOKLYN CENTER, Minn. (AP) — Republican presidential candidate Scott Walker is offering an alternative to President Barack Obama’s health care law that would provide tax credits and restructure Medicaid. And he took a swipe at GOP rivals in Congress for their inability to repeal the law. The Wisconsin governor detailed his proposal with a slide presentation at Cass Screw Machine Products in suburban Minneapolis. The proposal calls for repealing the law immediately and replacing it with a plan that gives states more power to operate Medicaid. It ties refundable tax credits to age rather than income and it shifts to discretion of states the decision on whether to offer the popular Obama provision that allows people up to age 26 to stay on their parents’ insurance plans. It’s Walker’s first major policy initiative of the presidential campaign.