Should Obama supporters be worried about the polls?

Robert Arena at AMERICAblog says yes:

While some here think everything is going just fine, and that Obama has a secret plan lying in wait, I ask you to think back a year ago. Imagine if someone had told you that the most charismatic Democratic speaker in a decade would be in a dead-heat with a Republican has-been corrupt waffler — you would have laughed in their face. After eight years of George Bush? No way, people are fed up — that'll never happen.

Well, that's the reality today. This race is a dead heat and is up for grabs both in the national polls as well as in key states like Ohio, Florida, Missouri, etc. Face reality, folks — something isn't working.