[Juancho_Villa]

¿Cómo votar por Trump si eres mexicano?

[josu]

You are indeed correct.

a is Spanish Spanish

por is Mexican Spanish

[Cheezmeister]

I'm rusty but, como votar por Trump si __seas__ Mexicano? Or is the eres Mexican, too?

[alanh]

If you are indeed Mexican, the subjunctive shouldn’t apply anymore, as there is no doubt/speculation/hope involved. (Caveat: Non-native and also a bit rusty)

[algorias]

What you mean is "si fueras mexicano". "si seas" is just wrong.

[glastra]

"fueras/fueses" would be the right verb form, but that would be equivalent to "How to vote for Trump if you WERE Mexican" as opposed to "How to vote for Trump if you ARE Mexican".

[Kluny]

Buy yourself a non-voting american. I'm sure there's a few left.

[alanh]

*I’m sure there are a few left

(Since we're apparently debating grammar in this sub-thread)

[jschwartzi]

I should really start a website that lets people bid for each other's votes online.

[NKCSS]

I believe you'd make a killing, but I'm not sure it would be legal (and if so, I'm pretty sure they'll put a stop to it asap).

[throwanem]

Vote buying and selling is election fraud per 18 U.S. Code § 597 [1]. In fact, it's not even legal to make the offer, in either direction:

"Whoever makes or offers to make an expenditure to any person, either to vote or withhold his vote, or to vote for or against any candidate; and

Whoever solicits, accepts, or receives any such expenditure in consideration of his vote or the withholding of his vote—

Shall be fined under this title or imprisoned not more than one year, or both; and if the violation was willful, shall be fined under this title or imprisoned not more than two years, or both."

[1] https://www.law.cornell.edu/uscode/text/18/597