I tend to disagree, the Post preaches to the beltway choir, and if there is any place in the US that would support their liberal content (outside of NYC) it's the beltway. I think the Post is just another "victim" of technology.
I do not deny what you are saying about print media declining but it is the post and the slimes that manufacture the news on cbsnbccnnabcmslsd etc... and I read the post quite often and it is a rare occasion that they are not just hard core socialist/communist in their slant.