Yes it is. God expects Christian citizens to do their civic duties.
Put them in mind to be subject to principalities [rulers] and powers [authorities], to obey magistrates, to be ready to every good work... (Titus 3:1)
Some translation have "governments" and "officials". The government of the USA is under the final authority of the Constitution, which requires elections.
Article I
Section 2.
The House of Representatives shall be composed of members chosen every second year by the people of the several states, and the electors in each state shall have the qualifications requisite for electors of the most numerous branch of the state legislature.
Similarly, for the president, but every four years.