Going with a full, strong impeachment case in the House will galvanize the affected constituencies to support this effort. It will put the Senate Republicans in a very tight spot of choosing between their political futures and Constitutional duties or the political fate of Donald Trump.
Failure by Congress to prevent devastating precedents from being invoked and followed by future presidents will create a legacy of disgrace for Congress. Above all, for Speaker Pelosi, a broad and compelling indictment of Trump will move the citizens otherwise described by Abraham Lincoln as the "public sentiment," to sustain an impeachment verdict by the Senate.
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