Many people probably don't remember, but WND was the organization that fought for and won the right to be an accredited news service at the White House. At the time, the newsies all banded together and only allowed themselves (the networks, the newspapers, and news mags) to be accredited to cover the White House and Congress.
At first, they declined to admit WND into the press rooms. WND fought and won.
WorldNetDaily locked out of Washington press corps: Joseph Farah slams government media-cabal
The Senate's Star Chamber: Joseph Farah updates readers on accreditation fight with news police
WND banned from covering Capitol (Paul Sperry)
Galley Gatekeepers - The Politics of Press Credentials
Prior to the credentials fight, WND was at the forefront of reporting on Clinton White House shenanigans. Paul Sperry was their top investigative reporter at the time. Sperry reported on how Clinton purposely downgraded the telephone systems at the West Wing in order to hide calls going to/from specific telephones.
Sperry also reported on missing White House emails of Al Gore, and how the entire email archive process was tainted.
But the highlight of WND reporting was the 2000 series on the Gore family in Tennessee, which resulted in Tennessee voting for George Bush. If Gore had won his home state, the Florida fiasco would never have happened.
WorldNetDaily's investigations into Clinton and Gore gave us the George Bush presidency.
-PJ
Yes you are right that they have done good work over the years fighting the liberal press in D.C. They were one of the first conservative sites out there.