Why anybody would expect any other than a liberal endorsement from a known liberal editorial page escapes me.
The benefit of complaining about it everyday also escapes me.
Why not invest the resources into alternate media, eg a print equivalent to Fox?
Actually, Washington, DC does have a viable and effective conservative alternative to the WaPo: The Washington Times.
There is ... the Washington Times. It's only able to survive financially because the owner, Rev. Moon (the Korean Unification Church) underwrites the losses. In addition, the free Examiner newspaper (not just in DC, but in most major cities) is conservative.
The Washington Post sells 6 or 7 copies, however, for each copy the Washington Times sells. As bad as the Post's finances are, I doubt the Washington Times has ever come close to breaking even, let alone earning a profit.