Really? Bill Clinton and Teddy Kennedy are both scheduled to speak at said Democratic Convention. If you hear of any rapists and/or murderers doing the same thing at the Republican Convention, do let me know.
I strongly suspect that the difference between things that Kennedy has done and things that some GOP'ers have done is that Kennedy made the papers and they didn't, because their name wasn't Kennedy and wouldn't sell papers. As far as Clinton goes, all we have on him regarding rape is a "he said/she said" allegation that has never led to an arrest, never mind a conviction. I hold no brief for the morals of either man; I find them deplorable. But only God knows if they've raped or murdered, not man.