It is tempting to say this bodes poorly for Kerry, especially since many Democrats have been using the alleged high voter turnout to support their prediction of a Kerry victory. However, I think it actually shows a reasonably well-informed electorate. The states with high turnouts were mostly the ones where the outcome was in doubt. For example, Edwards won South Carolina, not Kerry.
By the time Super Tuesday rolled around, Kerry's victory was assumed by almost everyone. Indeed, the only real news was that Kerry did not win Vermont. So while if Super Tuesday had shown record turnouts, the Democrats may have been justified in seeing this as a sign Bush's reelection is in trouble, the reverse does not hold. Democrats may or may not be excited about Kerry. But American voters are smart enough to know when their votes do not matter, and I can understand why many Kerry supporters would have stayed home on Super Tuesday. Their candidate already had the election wrapped up.