Yes, it is a duty for believers to take a stand against those re-imagining our republic into something ungodly. Casting a vote is hardly a burdensome deed especially since America's very essence is being threatened (eg, increasing the size of the Supreme Court and making America a Free-for-all for the world's poor). God doesn't expect us to lay down but to stand (Ephesians 6:13). His servant Nehemiah also built a strong wall against neighboring countries who were raiding them.
What is godly about President Trump in contrast to Joe Biden?
For one, he is protective of his countrymen much like God is with His family, whom He wants safe and nourished. Joe Biden would have the world's poor overrun us and, further, force American workers to support lawless foreigners for life regardless of whether or not they work for benefits which are earned by American laborers, such as stimulus payments, unemployment compensation, food stamps, Medicare and Medicaid, and Social Security. Donald Trump has constantly sought to relieve citizens of this enormous financial burden, not to mention the diseases and crime that so often accompany those who sneak in.
President Trump also understands that the best way to help his countrymen prosper is to stimulate job growth, and he has already proven he can do that. He will do it again, and that's why he will be reelected.