critical races out here in arizona. if they go the way of the republican vote, then you're looking at a clear majority come seven days from now. but as we also watch the races to watch in the state of pennsylvania, there is one district that tells a very interesting story about how these two men are running against each other. this is the 12th district here, you've got the democrat democrat mark kurt -- critz against republican tim burns and carl says we got to go there now! carl is in central p.a. good morning. >> reporter: hi bill. this is a fascinating race a. rematch of a recent democratic victory. this is the seat that jack murtha, the very well known veteran of the u.s. house held for 36 years before he passed away last year, and in may, there was a special election, and at that time his long-time staffer mark critz, a democrat, won the seat and has occupied it since then. this general election is a