Refusing service because of political party.

[brewer]

Why didn't the prosecutor retry the case, or have you already knee capped him?

Double jeopardy would come into play here. The case was tried and went to the jury where a decision was rendered. Once that happens,  you then need to go through the appeals process,  which is evidently how the case got overturned.

Double jeopardy laws prevent the same person from having the same case tried against them twice, once a verdict has been returned.

I could be wrong but I believe that on appeal the previous verdict is thrown out, no new verdict is given (can't change guilty to innocent, just remove guilty). The prosecution then has to decide if they are going to retry the case or not. 

https://www.americanbar.org/groups/publi...peals.html

https://en.wikipedia.org/wiki/Double_jeopardy   (take note of valid acquittal or conviction)

I think I watch more Law and Order than you.