washington u.s. supreme court monday reject request revive investigation wisconsin whether governor scott walker campaign withstand union-backed 2012 recall election illegally coordinate conservative advocacy group align justices first day new term let stand 2015 wisconsin supreme court decision end probe whether republican governor conservative group violate campaign finance laws investigation lead special prosecutor francis schmitz launch two months walker become first state governor u.s. history survive recall election walker last year mount unsuccessful bid party presidential nomination unite state supreme court wisconsin supreme court multiple judge reach conclusion every rule investigation prosecutors without merit thus must end walker say statement walker last year sign state law prohibit prosecutors use wisconsin secret investigation statute use convict four aid investigate campaign probe political crimes three democratic county prosecutors ask justices hear appeal state court rule express disappointment state supreme court decision leave intact today order prohibit wisconsin citizens enact laws require full disclosure disguise contributions candidate say statement include money spend third party direction candidate support candidate election add investigation focus possible unlawful coordination walker campaign conservative group include wisconsin club growth 2011 2012. federal judge 2014 initially stop probe wisconsin club growth file lawsuit accuse investigators sideline group political activities violate right u.s. constitution free speech association equal protection law federal appeal court late say investigation could continue wisconsin high court ultimately stop brendan fischer lawyer campaign legal center advocate strong enforcement campaign finance laws say justices move endorse walker action governor walker secretly tell out-of-state donors could support secretly give wisconsin club growth emphasize could accept corporate contributions without limit fischer say walker campaign adviser control wisconsin club growth spend money win re-election walker sign legislation advance interest secret donors u.s. top court reject bid revive wisconsin governor probe