Democrat pols have the scorpion problem. Asking for Trump’s tax return without a legitimate legislative purpose is unethical and corrosive to our system of government, but over-reaching is in their nature. It is to Speaker Pelosi’s credit that she has been able, so far, to hold back the coalition of partisan opportunists and ideological zealots who miss the point of opposing Trump. What America needs now is a return to good governance, something that is best proved by doing, not talking.