Pittsburgh Later this month, voters in Pennsylvania’s 12th Congressional District will go to the polls to elect a replacement for John Murtha, who passed away earlier this year. The race promises to have major implications for the November midterms. Pennsylvania’s 12th District stretches for more than 100 miles across the southwestern corner of the state. Like the rest of greater Pittsburgh, the district has been trending Republican in recent decades, but voters here are not really “Reagan Democrats.” Whereas places like Macomb County, Michigan, famously swung to Ronald Reagan in 1980 and 1984, southwestern Pennsylvania voted for Jimmy Carter, then...