Esta é uma outra maneira de escrever: I would like to share that my country; Brazil, is holding our presidential election. Sadly; it appears that my candidate is not going to win, but I hope that she tries again next time. 

Elections - Brazil

Hello! I'm here to share with you guys that in my country, Brazil, we('ve) just had our presidential elections.
Unhappily, my favorite president was not elected, but I have hope that some day, she will (be).

Very good. I fixed some commas and changed all the tenses to the past, since I believe the elections were over when you wrote this. (Also, I don't believe you have paranormal powers allowing you to predict the future  ;)

Elections - Brazil

Hello! I'm here for to share with you, guys, that in my country -Brazil- do have is holding elections for presidents (presidential elections).
Unhappily (unfortunately) my favorite president (candidate for president) not will will not be elected, but I have hope that in some day, she will.

Hello! I'm here for to share with you, guys, that in my country -Brazil-  is holding elections for presidential elections.
unfortunately my favorite candidate for president will not be elected, but I have hope that in some day, she will.