What does Iowa turnout mean?

So by now everyone knows that Obama and Huckabee won the Iowa caucuses. But perhaps less well known is the dramatic difference in voter turnout — between Democratic and Republican, and in 2008 compared to previous years.




Iowa Caucus Turnout, 2000–2008
2000

60 760

87 666

2004

124 000

  uncontested (George W. Bush)
2008

221 000

116 114








Some of the numbers above are approximate, but the trend is clear: a huge increase in Democratic caucus participants (78% more than in 2004, and 90% more Democrats than Republicans this year). My understanding is that the Democratic caucuses also require more time and involvement than the Republican ones. All of this adds up to a lot of enthusiastic Democrats — at least in Iowa.


Here's what that looks like if you break down each bar according to the proportion of support that each candidate received.




Iowa Caucus Vote Distribution, 2000–2008
2000

BradlGore

BushForbesKeB

2004

GeDeanEdwardsKerry

  uncontested (George W. Bush)
2008

ClintonEdwardsObama


HuckabeeRomneyThoMcPa









What do you think this means for the election as a whole? Is this phenomenon local to Iowa, or is it a sign of things to come?

Sources:
MSNBC,
AP,
CNN,
Eric Appleman.