Yes, you are right. Unfortunately, most voters don't have a grasp at the simple concept of supply and demand. Thus they didn't (and still don't) recognize a hyperactive economy like that of the late 1990's that was based on overextended credit and speculation, much like that of the 1920's. Oh, granted, they do know plenty of their personal economy, but they either cannot or don't wish to grasp the big picture.
This poll does illustrate that the liberal media's continued attack on the economy is gaining traction. We're not in a recession, and yet they call it one. The overall market's primary downward force is both the uncertainty as related to the Iraq situation, and the correction from the late 1990's when "artificial exuberance" was king. What magnifies the idea that the economy is in sad shape is that the liberals are selectively using the stock market as the only indicator of economic strength while they talk things down.
Perception outranks reality.