FIRST ON FOX: Americans for Prosperity Action, the political wing of the powerful Koch conservative network, is launching a multi-million dollar ad blitz across battleground states targeting vulnerable incumbent Senate Democrats and boosting their Republican opponents ahead of the November election. The influential conservative group is spending $5.75 million on ads across Wisconsin, Montana, Nevada, Ohio and Pennsylvania. Tim Sheehy, a Republican candidate for U.S. Senate in Montana, will get $1 million in ads in support of his bid, as will Sam Brown, the Republican candidate for Senate in Nevada. Republican candidates Bernie Moreno in Ohio, Dave McCormick in Pennsylvania and Eric Hovde in Wisconsin will each get $1.25 million in ads supporting them. The digital ads will also air on TV in the pivotal battleground states. …