Can't we all just get along? Not these days. Not if you're a Republican facing a Democrat in the Senate, where one lawmaker says the people's business isn't getting done because "gotcha" politics "has poisoned the atmosphere." In fact, should the trend continue, "the Constitution is not going to work as it was intended to work," warns Sen. Bill Nelson (D-Fla.). "The sharpness of this poisoned atmosphere of excessive partisanship and excessive ideological rigidity has made it very difficult for this government to function," he says. Under the Constitution, the separation of powers is a check and a balance against...