Some Christians Will Not Be Voting Because They Don't Approve Of The Choices.

“For the Lord will not abandon His people on account of His great name, because the Lord has been pleased to make you a people for Himself,” said Samuel to his nation. 

“Moreover, as for me, far be it from me that I should sin against the Lord by ceasing to pray for you; but I will instruct you in the good and right way. 

Only fear the Lord and serve Him in truth with all your heart; for consider what great things He has done for you. 

But if you still do wickedly, both you and your king will be swept away.” 

http://biblehub.com/commentaries/1_samuel/12-22.htm