A new poll says Pennsylvania’s race for U.S. Senate is not yet a done deal. The latest Emerson College poll gives current Democratic Senator Bob Casey a four-point lead over Republican challenger Dave McCormick, 48-44. But the poll says eight percent of Pennsylvania voters have yet to make up their minds. The four-point spread is the same as Emerson’s poll from July, but it’s a narrower lead than the same poll from back in June. The poll says the economy remains the top issue for voters in Pennsylvania, with over 51 percent of people saying that’s the most important thing to them.