Janeane Garofalo declares Tea Party attendees racist and Keith Olbermann agrees.

When you don't have a rational response to a legitimate criticism about economic policy... call them a racist.

http://en.wikipedia.org/wiki/Discrediting_tactic

In public discourse, especially in societies with free speech, one of the most successful tactics to drain support from a cause is to discredit its spokesman. This tactic is similar to using an ad hominem argument in a debate. By discrediting the spokesman of a cause, the opponents of the cause hope that supporters or potential supporters will withdraw or withhold their support. In such a situation, the attitude seems to be: "If a person with this moral character or that level of intelligence supports the cause, it must be a bad cause.
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Keith does a great job of proving the practice of discrediting - sit back - watch and laugh - because you know exactly what he's doing.
If he has to waste his time doing this - what does that tell ya? LMAO