Certainly there is no one above reproach. I mean anywhere in society. For people to think that there is someone within the political arena who has no skeleton in their closet somewhere (or at least something that with proper lighting and arrangement could look like a skeleton).
I personally believe that almost all people in politics enter as a means of serving the public. Their views of the public need may not correspond with mine (see NDP policy), but their intentions are good. What happens is that in the process of coming to positions of influence and power, they are corrupted by the political system.
Follow along. Jane Doe and Joe Smith enter the political arena with good ideas and a desire to help shape Canada in a positive manner. They do not immediately get a nomination, they must join the party first and build up support. They do this and build some relationships to help them along. The first tethers are placed. Finally gaining enough momentum, they run in an election and win. They are part of the goverment as a whole. A second tether. After making friends and influencing people, they decide to run for leader of their party. They need to raise funds to support this run. They win and become the leader of their party. A third tether is placed. Now the leader tries to get elected as PM or even premier. This takes more money so they enter the fund raising ring again. A fourth tether.
For evidence, look at the links between the union and the provincial NDP. The unions are running rougshod over the people in our province with government sanction.
In this process, the candidate has had to become proficient at the political game, but is now so pulled in varying directions that their ability to actually affect change is greatly compromised. I hope that both provincially and nationally we change the government, not just who is in power. To whoever is able to do this, I commend you.