Jennifer Rubin: How we will know if impeachment is the right thing to do?

Democratic leaders are right to caution their members and candidates against talking up impeachment. There is the obvious political consideration that impeachment is disfavored, at least now, by many voters, especially those in red states where Democrats need to hang on to precious Senate seats. But there is something more important, both for the party fighting against the erosion of democratic norms and for the country: We cannot normalize impeachment.Rep. Adam Schiff of California, ranking Dem