It's a virus -- and it's spreading. Do a Google News search for "since the Great Depression," and you come up with more than 4,500 examples of the phrase's use in just the past month.

But that doesn't make any of it true. Things today just aren't that bad. Sure, there are trouble spots in the economy, as the government takeover of mortgage giants Fannie Mae and Freddie Mac, and jitters about Wall Street firm Lehman Brothers, amply demonstrate. And unemployment figures are up a bit, too. None of this, however, is cause for depression -- or exaggerated Depression comparisons.

Overall, the pessimists are up against an insurmountable reality: In the last reported quarter, the U.S. economy grew at an annual rate of 3.3 percent, adjusted for inflation. That's virtually the same as the 3.4 percent average growth rate since -- yes -- the Great Depression.

Why, then, does the public appear to agree with the media? A recent Zogby poll shows that 66 percent of likely voters believe that "the entire world is either now locked in a global economic recession or soon will be." Actually, that's a major clue to what started this thought-contagion about everything being the worst it has been "since the Great Depression": Politics.