This is just a thought to offer. What if there is no good candidate, the Lord not willing to any longer bless a wayward, proud and unrepentant nation? The Lord has allowed bad leadership to punish nations, allowed pagan nations to execute judgment on Israel, for instance, allowed many evil leaders to prosper, for a time.
When you look at the decline in recent decades, on multiple fronts, to where we are now in such open, escalated rebellion against God, such as so-called gay marriage, are we, in fact, getting what we deserve? What if the Lord has ordained it suitable we have another piece of the unmentionable in the Oval Office? Could it be the nation is not to have a good choice, at all? Can a nation turn its back on God, then ask His blessings? Is Holy God so mocked?
I find it striking the vast majority of people are alright with a host of evils. Perhaps a people intent on going to the devil are best led by a devil, then? After all, if you don't want God, about all that's left is the other guy, right?