A turnout map might also be interesting. All the data is on the SOS website if anyone cares to do it.
In Harris County, it was 2.27% for Republicans, 0.80% for Democrats. Texas doesn't have party registration, so these are relative to total registration.
For the primary in April it was 8.49% for the Republicans and 5.38% for Democrats.
The Democrats didn't have any statewide races, and the only Republican race was for the Supreme Court seat. A lot of the turnout was in specific districts. About 5% was in a Lubbock House district where a forever incumbent Delwin Jones was defeated (he was first elected in the 1960s), so turnout was probably 7 or 8X of that statewide.
There apparently not enough bikers in El Paso where Norma Chavez was beaten.
And turnout was a little bit higher in CD 15. Curnock was the Republican candidate in 2006. Flores has some more money. If Nancy Pelosi was a real leader, she'd come campaign for Edwards.