I challenged your source as biased. You can prove it or you can't. I don't have to prove anything, it was your allegation.
Here is the timeline:
April 9th: Rep. Jeff Miller, R-Fla., chairman of the House Committee on Veterans' Affairs, says during a hearing that dozens of VA hospital patients in Phoenix may have died while awaiting medical care.
April 16: A Phoenix rally organized by Concerned Veterans for America and attended by Rep. David Schweikert, R-Ariz., draws 150 veterans and their supporters calling for solutions to the controversy.
April 28: Obama orders General Shinseki to investigate and reports it at a news conference in Manilla.
May 1: U.S. Secretary of Veterans Affairs Eric Shinseki places Helman and two others on administrative leave.
May 2: Mitchell goes public with her allegations about mismanagement of the Phoenix VA system and her concerns about wait times, noting that she and a co-worker moved to protect some documents as evidence.
These things were reported.
So exactly who 'broke' the story on April 23? That was weeks after two Congressmen called public attention to it. Wikipedia says that CNN reported the story on May 30. If it was liberal bias to delay the story, why didn't FOXNews break it earlier?