Would he be? Or would he just be someone always appearing in the press bashing his own party? If he would be like Susan Collins and basically serve as a place holder holding a seat numerically the Democrats should ideally have (and probably will obtain once she retires) and not be a show boat, that would actually be fine. But based on his current and past behavior, that doesn't appear to be the case.
50% is more than 0%. Simple as that.