because they see the corrupt politicians as a minor fluke in the magical rainbow world that is "justice" and corrupt business people as a rule of thumb in an evil business world.
You see, they don't seem to understand that the more money you have, the less you get from the government AND the more you have to give to them. You get more from the government from giving less. Where as in the business world, those evil people want you to pay proportionally to your consumption.
So when politicians are shown as corrupt, they don't see it as an unqualified jacka** being stupid and/or power hungry, they see it as someone either breaking the rules to help the less fortunate or as someone snapping under the pressure of trying to help the less fortunate. Whereas they see business people as being selfish and that the corrupt have broken under the pressure of their overwhelming greed.
So they don't complain about the poor ol' politicians that couldn't take the pressure of being the helpers of the less fortunate and their heads explode when they find out someone wanted money for something.
Basically every day is opposite day for them...
EDIT:
Is having big ears some sort of metaphor that I've just never heard of before, a racial stereotype, or have I just not payed enough attention to Obama's facial features?
And most non-liberals consider Obama's promise to weed out government corruption the same as his promise to protect the second amendment....total BS....he wants to re-enact the "assault weapon's" ban (seriously unnecessary infringement) and the man's political experience comes from CHICAGO (I'll say its not corrupt for the right price)!