As a moderate, U.S. Sen. Lisa Murkowski sometimes votes with the Republican fold, sometimes against. And sometimes she does both on the same issue, as she did this month on raising the debt limit. Last week, Murkowski broke with most of her party when she voted to make it easier for the Senate to pass an increase in the national debt limit. “Because it was the right thing to do,” Murkowski told reporters. Without an increase, the government would run out of money to pay military and civilian salaries, debt payments and other spending Congress has already agreed to. Murkowski...