I'm talking about the good ones on both sides, not the tossers and the hacks. Their occupations draw them apart, whenever there's a search for truth. Their mind-sets are irredeemably at odds, in a way that makes it harder for the politician to understand the journalist than vice versa. At some deep level, he doesn't understand what the journalist is about. In the mind of the average politician, there's no such thing as detachment.
Every politician lives by bias.
An absence of bias, which would mean an absence of one-sided commitment, is inconceivable. The professional pol exults in the stuff, can't live without it, depends on a rhetoric that can never admit to more than a single version of wisdom. Which is all very well - but it doesn't stop there. Such minds find it hard, usually impossible, to understand that other minds are different. Especially the mind of the journalist, who deals in the same issues and drinks from the same tap, and must therefore surely experience the same strong opinionated pull to one side or the other.