If a Florida politician were to intervene to get this case thrown out summarily, then the Federal DOJ would step in and make a Federal case. Zimmerman is probably far better off with the current proceedings as long as they come to a natural conclusion.
I suspect that this may be the only reason that Zimmerman did not make a pleading under “stand your ground”. The length of the proceedings gives George a chance to have cooler heads consider the evidence. He is less likely to get railroaded by the Feds later.
If Zimmerman is acquitted or his case is dismissed at the State level, the Feds will file a criminal civil rights charge against him.