Clinton didn't invent political philandering. He wasn't the first and he certainly isn't the last.
There have been others...
Thomas Jefferson, John F. Kennedy, Grover Cleveland, Woodrow Wilson, Franklin Roosevelt, Lyndon Johnson... just to name a few.
What the president (or congressman) does with his noodle has nothing to do with his ability to represent the people. We are electing someone to represent us, the unwashed masses. I'd prefer it if he had a little dirt of his own. Good judgement comes from experience. Experience comes from bad judgement.