When Mitt Romney's bus tour pulls into Pennsylvania on Saturday, it will be entering a state no Republican candidate has won since George H.W. Bush in 1988. John McCain lost the state to Barack Obama by more than 10 points in 2008, and with 1 million more voters registered Democrat than Republican, it should be enemy territory for the Romney team. But Romney will make three stops there on Saturday and this time the GOP thinks it can take the state and its 20 electoral votes. The presumptive nominee is sounding confident, telling a Philadelphia radio station this week, "We...