The history you refer to includes indicting far more Democrats than Republicans. History also reveals that Delay has had numerous ethics lapses and has been admonished by the House Ethics committee. Let's wait and see, but I think Delay may be in hot water. Corruption respects no political party affiliation.
 

Travis County is 90% Democrat, so percentages favor more Democrat indictments. This is the same DA, who incidentally is letting accused murders in his on county go free because he supposedly doesn't have the resources for a case that won’t grab national headlines, and has give speeches at Dem Fundraisers singling out his prosecution of Delay while supposedly secret Grand Jury testimony was going on. I doubt these charges have merit.