Taking the "San Diego" model as an example, you're right. In heavily Republican San Diego the voters were fed up with their crook Republican mayor, so when the election came around the majority voted for the write-in Democrat candidate Donna Fry. But the Repugs threw out a couple thousand ballots as being invalid because those people did not "check the box" next to the line they wrote her name on and the Repug crook mayor running for re-election was declared the winner by about a hundred votes. A couple of months after he began his second term even more of his sleaze came to light and he was kicked out of office. When they held special elections for mayor some months later with all new Republicans, the people lost their anger and thought "oh, well these other Republicans are different" and Donna Fry the Democrat, who "really" won the first time, lost when she ran again. So yes, it's better for us if DeLay doesn't lose his primary race.