I don't see too much difference between the Democrats and Republicans on this. When Bill Clinton was in office the sexual offense that happened took place in the Oval Office, or right off it, and Bill Clinton lied about it. I have no doubt that Trump did what is alleged he did but that these things were done before he was running for President and not in the White House or during his Presidency. The act was the exact same thing, a sexual indiscretion while married with a woman, not his wife. Clinton's happened in office and in the White House to a paid employee where Trump's happened before he was President. Another vast difference is how the media is treating it. Did they give 1/10th the coverage that is given to Trump to Clinton? Did they jump on the bandwagon gleefully seeking impeachment?
Actually, Clinton was put up for impeachment because he was caught lying and not because of the affair. As for what happens to Trump time will tell but how it affects his future plans to run is what is unknown at this time. Now contrast both Clinton and Trump with Kennedy. There is no comparison. Heck Kennedy had so many affairs going on and with the Secret Services help and the media looking the other way always. Speculation still is rampant as to whether or not the affair with the Kennedys (Robert also) led to the death (murder) of Marilyn Monroe.
The real question is, and it's not a pretty one (the question that is), does their affairs with these women, immoral as they are, affect any of their abilities to be President and perform their job? If Clinton's affair with one of his paid employees wasn't enough to warrant impeachment then why would Trump's affair before he was ever elected justification for an impeachment which is what Democrats are salivating for?
They were all wrong! Kennedy, for the most part, continued to get away with his indiscretions whereas Clinton I believe was allowed to his wayward ways by Hillary. That or she was the most naive woman alive. As to how this plays out with Trump and his wife and those who elected him that remains to be seen.