best selling author and forensic expert patricia chron wall. >> it is not just winning the lefblg it is changing the country that's really important. >> wisconsin, maryland and d.c. vote tomorrow. the question mounts, will rick santorum stay in the race? we'll ask him tonight. also, keeping america great. the man behind ford's rebirth. turning down a bailout and turning his business around. >>> plus, only in america, strurk by lightning after buying his mega millions ticket. if it wasn't for bad luck, he would have no luck at all. this is "piers morgan tonight." good evening. our big story, the death of trayvon martin. unanswered questions are piling up in this case. two audio experts say the screams on a 911 call do not seem to be the voice of george zimmerman. the surveillance video on zimmerman at the sanford police department which an outside company for abc news seemed to show some kind of marks on the back of zimmerman's head. much more on that in a moment. just hours from now, republicans turned their epic battle to wisconsin, maryland and d.c. for tomorrow's vote. it will be