Pushing an impeachment resolution before the conclusion of Mueller's investigation makes it look blatantly political and hurts the case of any similar resolution in the future.
Agree. Jumping the gun will only let Republicans conflate an impeachment attempt of Trump after genuine crimes are revealed with the bogus one earlier. Be patient and let Mueller finish his job.
While I certainly hope that Mueller's investigation nails Trump's scalp to the proverbial wall, and agree that politically it's very unlikely to succeed, I still can't bring myself to oppose this.
Let the politicians currently in office violate their own oaths by refusing to remove a man who has defecated on the Constitution and traditions of our Republic. Get Trump's violations of the Emoluments Clause out in the bright light where everyone is forced to acknowledge it.
We cannot let fear of deplorables being deplorable stop us from doing what is right. Trump could be raping schoolgirls like Moore did and the GOP would still not impeach him. He could be genetically and cryptographically proven to be a Russian deep-cover mole who handed our nuclear secrets to the Kremlin and they'd still whine that impeachment was political.