I agree that elected officials and candidates are always looking to influence voters minds and the process itself to win. However, pursing better access to voting isn't unethical, even if people pursing those policies and systems themselves are attempting to use that access to bolster their own support. In fact, I would say that pursuing actions with positive externalities and outcomes that bolster your position is what we want politicians to do: being so successful at fixing and addressing our problems as a society that we want them in office again and again.

Granted, I don't think that the US gov't is an example of a system in which we are achieving wild successes and are therefore wanting to keep certain people in office :-)