I have seen it my entire life. When Republicans are in the White House, the country is always teetering on the edge of an economic collapse despite the news of stable and/or improving conditions. Every piece of good economic news is always dampened with some sort of qualifier in order to make you feel on edge. During the entire eight years of President Bush every piece of good economic news was always dampened down by the media with their "yea, the economic news is good, BUT..." line. Not so when Democrats (and particularly President Obama) are in the White House. We've got nothing but bad economic news since Obama was sworn in, but according to the liberal mainstream media, it's nothing but gumdrops and lollipops, incense and peppermints, and unicorns prancing in the fields.
Ed Frank, of Frank Strategies: The Blog, has noticed it also. He's put together a terrific video documenting this phenomenon which you need to see.
Video: Economic reporting, then and now (Hot Air)
Obama’s Stimulus Is An Early Failure… (NEOAVATARA)