The largest US Catholic advocacy group is launching an ad campaign blasting Vice President Kamala Harris for supporting taxpayer-funded sex-change surgeries for minors. The scorching six-figure ads will begin airing Monday in four critical swing states – Pennsylvania, Wisconsin, Nevada and Michigan – and are intended to target Catholic voters and households with children. The ads, shared exclusively with The Post, cite Medicaid data that show the number of sex-change surgeries performed on children in each state. “Just in: Medicaid data shows [97 in PA; 86 in WI; 18 in NV; 35 in MI] underage girls had their breasts completely removed,” the…