Bill Clinton most certainly did not get a free pass.  The impeachment process went on for a VERY long time.  It was run by someone who could be said to have gotten a free pass; Newt Gingrich who was having an affair with young intern while being married and trying to divorce his cancer stricken wife to marry the younger woman.

Over that very long time period, Clinton was subjected to the most intrusive of investigation, dna testing, we learned which way his penis twichted  and other personal details no one needed to know - every night on the news.

If many people (none on the political right it seems) have given Clinton a pass it was likely a result of his other characteristics, the vulgarity of his prosecution and hypocrisy of his prosecutors ... and the fact that with some arguable exceptions (all of which were dismissed)  - Clinton appeared to be having "affairs" not attacking/raping women.

Also - Linda Tripp.

http://academic.brooklyn.cuny.edu/history/johnson/clintontimeline.htm