All sides know that even if Trump is impeached by the House, the Senate will probably not remove him from office – the Senate vote would undoubtedly fall on partisan lines. Ukraine impeachment comes from an independent whistleblower, not from the Democratic party.
Second, the evidence in the Ukraine case is clearcut and irrefutable, only deniable by the most partisan hacks, while the proof in the Russia case is mostly circumstantial and requires a partisan bias to be considered beyond reasonable doubt.
In short, whereas the Russia impeachment would have been primarily about Trump, the Ukraine impeachment is first and foremost about US democracy As the House judiciary chair, Jerry Nadler, phrased it,
phrased it, “A president who places himself above accountability, above the American people and above Congress’s power of impeachment … is a president who sees himself as above the law … We must be clear no one, not even the president, is above the law.”
