It's not a "Hate Crime" but it is certainly not the truth. Immigrants that have become citizens most certainly can vote - the governor overreacted, but being an immigrant himself he was probably very insulted by it. Totally out of bounds, dishonest behavior by whoever is responsible for writing it.
The letter did not contain the word immigrant or any reference to immigration.
Emigrado, the masculine past participle of the verb emigrar (to emigrate) was used.
The street implication was; if you voluntarily left your country of origin without government knowledge, assistance or approval.