Ignore, of course, that Earle has, over his 27-year career, prosecuted four times as many Democratic elected officials as Republicans. Simply pointing this out to GOP whiners in the crowd probably won't get you anywhere, as they'll just hem and haw and say something idiotic like, "Yeah, well ... he's still partisan. So there." This is why you have to phrase your defense differently.
Rather than just point out the facts, you should use them as the basis for a counter-challenge thusly:
"You're saying that Earle's indictment of Tom DeLay is just partisan politics? Well, that's interesting since Earle has prosecuted four times as many Democrats as Republicans. So, how many more times should he have prosecuted Democrats for you to accept that this is not partisan politics? Five? Six? Ten? Come on, give me a number. How thoroughly unbalanced would that ratio have to be for you to accept that Earle is just doing his job?"
See how that works? It puts the burden back on the sniveling GOP whiner to defend his accusations of bias by actually coming up with a number. Of course, you know the number won't be forthcoming but the subsequent squirming is worth it, just for the entertainment value.
NOW THAT'S IRONY. From an article in today's Mope and Wail:
Elected to the U.S. Congress in 1984, [DeLay] chafed under Democratic rule for a decade before the GOP seized control. In 1998, he led the charge in impeaching former president Bill Clinton.
Identifying the resounding hypocrisy of this situation is left as an exercise for the reader.