It’s getting difficult to remember that the 42nd president of the United States was impeached by the House, tried in the Senate and then acquitted of the so-called “high crimes and misdemeanors” he was accused of committing.

The latest evidence of that is former President Clinton’s appearance in Kentucky of all places, where he is campaigning on behalf of a Democratic challenger to Senate Minority Leader Mitch McConnell. Allison Lundergan Grimes is seeking to unseat the veteran Republican senator, so she brought in the Big Dog to help her: William Jefferson Clinton.

Clinton is going where the current Democratic president, Barack Obama, dare not venture.

Let’s recall an important fact here. Clinton carried Kentucky twice in his two campaigns for the presidency. He won them both barely, but he won them. Yes, it can be argued that he had some help with the presence of Texas zillionaire H. Ross Perot on the ballot in 1992 and 1996, but I’ve never quite bought into the notion that Perot was responsible for Clinton’s two electoral victories, as national surveys indicated he took roughly equal numbers of votes from Republicans as well as Democrats.

The point, though, is that Clinton’s political rehabilitation now appears to be complete.

The man who was impeached for lying to a grand jury about a sexual affair with a White House intern has emerged as one of the more consequential ex-presidents in U.S. history. His Clinton Global Initiative targets crises around the world and lends support — and money — to nations and people in need. He remains politically active here at home. His wife, Hillary, is considering a run for the presidency again in 2016 and you can bet he’ll be hitting the stump for her as well.

It’s an amazing thing to see. A man who could have been kicked out of the presidency had he been convicted of those mostly partisan charges has come out burnished and all shiny on the other side.

Democrats with stars in their eyes want him to speak on their behalf.

So help me, they are going to write books on this incredible story of political redemption.