Brad DeLong has an answer for why the WSJ Editorial page is what it is:
As I remember--and since I didn't write down notes afterwards, I may have some details wrong--I was seated at lunch in Washington DC, and at the table immediately behind me were then-representative Charlie Stenholm (D-TX) and Senator Judd Gregg (R-NH). They started talking about why the WSJ editorial page was what it was. They settled on the conclusion that the Journal editorial writers thought that their role was to make not the strongest but rather the most persuasive case for lower taxes and Republican candidates in every circumstance--that they had a duty not to inform their readers, not even to make the truest arguments for the side that they had been hired to support, but rather to make the arguments for the side they had been hired to support that would strengthen that side the most by convincing the most people.