Incumbency is tied to money & its the money in politics that is hard to overcome. Our country would improve virtually overnight if all candidates, incumbent and otherwise, all had the same pool of money in which to campaign on.
The Riverfront Park vote is a perfect example. Those city council votes were the result of influence & money in politics and not a reflection of the will of the people who elected them into office. Appointments follow similar logic.
This dynamic will not change until the average voter can move beyond a flashy mail piece & 30 second sound byte. Not sure how bad things have to get before that happens but it's possible that will never happen & we as a society are virtually doomed. I tend to fall in to the latter camp.
I think the lack of challengers is also a reflection of a rabid, vicious society & press who is willing to say or do anything, right or wrong, to destroy a political opponent. Fewer and fewer decent citizens with children, families, careers & professional reputations at stake are willing to risk that.
We are absolutely being destroyed from within - terrorism aside. Sorry to be a debbie downer.
This is why I support the candidacy of Donald Trump. I believe he is the only hope to change the trajectory of corrupt government & politics as usual. If the Dems, GOP elite, & media all hate him, but the people love him - something is going on there.