How can liberals think the main stream media is not biased when they read articles like this:?

[Joe in texas]

(Reuters) - The number of Americans filing for jobless benefits unexpectedly rose last week, but not enough to change perceptions that the labor market was strengthening.

http://in.reuters.com/article/2012/03/08/usa-economy-idINDEE8270A120120308?type=economicNews