Over the past decade, [two oil billionaires] have built the most powerful political machine in Texas -- a network of think tanks, media organizations, political action committees and nonprofits that work in lock step to purge the Legislature of Republicans whose votes they can't rely on. Cycle after cycle, their relentless maneuvering has pushed the statehouse so far to the right that consultants like to joke that Karl Rove couldn't win a local race these days. Brandon Darby, the editor of Breitbart Texas, is one of several conservatives who has compared Dunn and Wilks to Russian oligarchs. "They go into other communities and unseat people unwilling to do their bidding," he says. "You kiss the ring or you're out."