Fewer Dems (about 31,000 +) than GOP (about 51,000 +) participated in the 13th Congressional primary!
Hope that is also true of the November election so the GOP can hold this seat.
The district has a GOP registration edge that probably matches those numbers. Thus the numbers are meaningless. What is not meaningless is the Bush percentage in 2004 as a partisan baseline, which will probably erode somewhat, if the Dem is competent and funded, or the GOP nominee proves to have problems.