For the record, Florida defines 2nd degree murder as:It sounds like the central argument will be over whether Zimmerman's approaching (if that's what happened) of Martin, against the advice of the dispatcher, was an "imminently dangerous" act by a "depraved" mind. In another words, would it be reasonable to believe that it would be likely necessary to kill someone if you approached them in that situation.
Under that definition, and according to the facts that have come to light thus far, I do not see a strong winning case for 2nd degree murder. That is not to say a prosecutor cannot win such a case, because seating a jury for this trial will be a nightmare. Get the "right" jury and you can get a conviction. If the defense gets the "right" jury, a hung jury won't be that far of a reach.
In the prosecutor's shoes, if I was going to charge, I'd include lesser included offenses. If the prosecutor hangs his/her hat on 2nd degree murder and that alone, the chances of a conviction go down.
But seriously.....with a Florida jury, who knows????