they win and we may see in-fighting how far to go. reporter: absolutely. melanie, great reporting. thanks. this morning, there are several senate seats up for grabs, including in wisconsin, where republican senator ron johnson has announced he is running for a third term despite having pledged he would only serve two terms. what are johnson s xhchances? joining me, our reporter and what s a good way to look at ron johnson s chances for re-election? reporter: a good way, look at history and what do we know about midterm elections? the presidential party is s often penalized during midterms and extreme correlation how they vote at the top, feel about the president, and how they vote for the senate. ron johnson and senate midterm since 1982 have won 86 out of 87 times in states where the opposition party outperformed the national vote share in the