Elections are coming what do you expect

This is not illegal. Candidates have the right of free speech, which includes signage.

Thank you for reporting an issue to the City of Jersey City.

Nobody has the right to post signage on public property without obtaining permission from the city. Read the JC Municipal Code.
By that argument, every business could put up signs anywhere they want.

Wrong, the city ordinance is unconstitutional. There have been many, many court cases affirming the rights of political candidates to post signage, it is a right of free speech.

An Inspector/Investigator from the office of Code Compliance has investigated your complaint and found Condition(s) Abated.