[visualops]

Voter participation in the front-loaded Democratic primaries that helped turn John Kerry into the party's presumptive nominee was among the lowest ever, according to a study released Tuesday.
An estimated 10.3 million people in 19 states and the District of Columbia cast votes in Democratic primaries through March 2, constituting just 11.4 percent of the electorate, said the Committee for the Study of the American Electorate. The nonpartisan, nonprofit research organization specializes in voter turnout issues.

http://www.sfgate.com/cgi-bin/article.cgi?f=/news/archive/2004/03/09/politics1609EST0713.DTL

If you go to any primary state's results page, you can see the turnout.
For example in Virginia:
Statewide Results
DEMOCRATIC PRESIDENTIAL PRIMARY ELECTION
Precincts Reporting: 2377 of 2377 (100.00%)
Registered Voters: 4,253,483
Total Voting: 396,181
Voter Turnout: 9.31 %

Now of course you'll have to distinguish between total registered voters and those eligible to vote in the Dem primary. One would also have to compare with previous turnout. This year, early seperate primaries had high turnout (due to money and focus no doubt) such as New Hampshire (something like 23% turnout).

[RasterMaster]

Thanks for the stats....THAT WAS FAST! I knew I saw it on FR!

[alrea]

Voter Turnout: 9.31 %

A high percentage of those that turned out were believed to be government workers that were allowed to leave for the day if they voted.