I have to say - I cannot find ANY political contributions made by Robert Zimmerman of Sanford, Florida in the database at
http://fundrace.huffingtonpost.com/
There is a Robert Zimmerman in Naples and one in Miami that have made contributions to various campaigns and PACs, but those are the only Robert Zimmermans in Florida who have.
The one I think is GZ's father owns a house in Sanford on which he gets homestead exemption (from the Seminole County Property Appraiser's office website). It's a pretty modest house, not in a fancy neighborhood. While being a retired magistrate may sound impressive, it doesn't really look as though it set up RZ to live an elaborate lifestyle and there is not evidence that he would have the clout to get favors for his son.
I more suspect that this case was a normal occurrence in the Sanford PD. Look at a previous case one of the first officers at the Martin scene handled:
It's not just Sanford, either - this has been a pattern in Central Florida for as long as I can remember, back to the 1960s: