It was about 4 p.m. when I came to the White House on Jan. 25, 1998, for a State of the Union prep session with President Clinton. It was like a bomb had gone off. Aides were in corners whispering. Clinton had just gone on TV and denied having relations with “that woman.” From that moment on, and for the rest of that year, it was an all-out battle for the White House. In the end, President Clinton revealed he did have an inappropriate relationship with Monica Lewinsky. He did lie to the American people, and he lied under oath about it. Yet he survived an impeachment trial to serve out his term, once again rising to new heights of popularity...