Um... What is a caucus?

I just learned what a caucus is, but do you know what it is? Take the poll below to inform my future readers.
Yes, I'm gona be around that long!


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<embed allowScriptAccess="never"  saveEmbedTags="true" src="http://www.polldaddy.com/poll.swf" FlashVars="p=138612" quality="high"  wmode="transparent"  bgcolor="#ffffff" width="252"  height="412"  name="beta3" salign="tl" scale="autoscale"  type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" ></embed><br/>Poll by <a href="http://caucusconner.blogspot.com/">Caucus Conner</a>