Impeachment for Donald Trump? Calm down, Democrats.

Politicians and skiers share one thing: It doesn’t end well for either if they get ahead of their skis. That’s something for Democrats to remember as some in their base start to demand impeaching President Donald Trump. California Rep. Maxine Waters and a few other elected officials, along with some left-wing advocacy groups, are suggesting that support for impeachment should be a litmus test for Democratic candidates. This movement draws fuel from polls showing rising public support for impeachment, especially from a solid majority of Democrats.

It’s a dangerous idea, as likely to end in a painful tumble as an inexpert skier’s plunge down a steep, bumpy slope. There may be respectable constitutional arguments for impeachment, which doesn’t require proof of a criminal act, but they should not be pursued before special counsel Robert Mueller completes his investigation beginning with an inquiry into Trump connections with Russia. (The president insists there were none.)

Still, there’s pressure on 2018 Democratic congressional candidates to endorse impeachment despite the opposition of their party’s congressional leaders.

These Democrats should look to the two modern examples: a methodical, deliberative, bipartisan impeachment process in 1974 that history has honored, and a cheap, rushed partisan effort in 1998 that left lasting scars.

With Republicans in control of Congress for at least another 19 months, impeachment is a moot point anyway. But if lots of Democrats commit themselves to the partisan approach taken by Republicans in 1998 it could backfire in next year’s elections, or force Democrats into premature actions if they do take over Congress.

In 1973, as evidence mounted against President Richard Nixon in the Watergate crisis, a few left-wing Democrats demanded a rush to impeachment. They were rebuffed by their party’s congressional mandarins, the Senate and House majority leaders Mike Mansfield and Tip O’Neill.

Instead, a case was carefully crafted by two special prosecutors, some tough judges and a select Senate committee led by Sam Ervin, D-N.C., and Howard Baker, R-Tenn. Their work paved the way in 1974 for the House Judiciary Committee, which then conducted its own six-month, deeply serious bipartisan inquiry before voting three counts of impeachment in July of 1974. Nixon resigned in August before the full House had a chance to vote.

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