Am I being unfair? Should I be leery of politicians in general?

I like Senator Ted Cruz and Trey Gowdy. I am sure they are examples of people who want to change things in Washington. However, despite their views, should I also be leery of them? After all, they are politicians. Should I be leery of even those whose views I agree with? It seems to me that politics is or has gotten too dirty (and way too partisan) and there are too many politicians who are corrupt or dishonest. I figure that anyone including they could be tempted because of the godlessness and corruption that is out in the political spectrum. Am I being unfair to be so leery of even those who don't (yet) have reputations or being corrupt, money hungry, or liars?