There are many verses that teach that a Christian can fall.
Quite a few are noted in this link:
https://www.youtube.com/watch?v=JVN7NXqwjro
For he that biddeth him God speed is PARTAKER of his evil deeds. 2 John 1:11 KJV
If we (knowingly) vote for/donate to/campaign for a politician who supports abortion, say, then we become an abortionist/murderer in the sight of God.
Noting the deceit that is necessary to get elected, long ago one preacher advised that Christians avoid participating in politics in any way, shape or form.
So, do we glorify the name of the Lord if we vote for the lesser evil?
If we grit our teeth and go ahead and vote, should we pray, confessing our sin (voting), ask for forgiveness, then vote again in four years?
The problem with that video is that it largely relies on things that some of the early church theologians wrote.