MOLLY BALL: Colorado Senate Race: Definitive Proof Republicans Are Getting Their Act Together; Representative Cory Gardner’s candidacy shows that Democrats could be losing their biggest electoral advantage: GOP disarray.

Gardner is a rising star in the GOP whose candidacy gives the party its best shot at unseating the Democratic incumbent, Senator Mark Udall. But perhaps more significant, it’s proof Republicans are reasserting control over the chaotic primaries that have been the party’s Achilles heel in recent years.

At the same time as Gardner entered the race, two others who had been running, Ken Buck and Amy Stephens, indicated they would drop out of it. Buck, a hard-core social conservative, was previously seen as the frontrunner, but now says he will run for Gardner’s seat in Congress instead. Stephens announced Thursday she was dropping out and endorsing Gardner. Though a state senator named Owen Hill remains in the primary, Republicans appear to have made a backroom deal to virtually clear the field for Gardner.

That’s the kind of backroom deal has repeatedly eluded the GOP since 2010, when the Tea Party revolted at party leaders’ attempts to handpick the most electable candidate for the general election. Right-wing bloggers and grassroots activists were incensed by the National Republican Senatorial Committee’s efforts to get moderates like Mike Castle, in Delaware, and Charlie Crist, in Florida, through GOP primaries. They rallied on behalf of candidates they considered more conservative, like Christine O’Donnell (of “I am not a witch” fame) and Marco Rubio. In cases like Rubio’s, this worked out fine; in cases like O’Donnell’s, not so much.

Of course, O’Donnell’s campaign imploded in part because of rampant law-breaking by the IRS.

Before running, O’Donnell had heard that if she chose to run in 2010 for the U.S. Senate against former Delaware governor Mike Castle, the IRS and others would “F— with her head,” in the words of a top Delaware political insider.

In short order, someone accessed O’Donnell’s tax return information containing private financial details. A U.S. Treasury agent informed O’Donnell that a Delaware state employee may have accessed her tax information and improperly used it. After an inquiry by Senator Chuck Grassley, the Treasury Inspector General for Tax Administration confirmed that unidentified persons, presumably IRS employees, had gained improper access to multiple individuals’ tax information. This indicates more than what President Obama would call a “smidgen of corruption.”

The IRS then wrongly attached an $11,744 tax lien to a property O’Donnell no longer owned, and political opponents speciously used the after-the-fact lien to damage O’Donnell’s standing and manufacture a tax scandal just as she launched her Senate campaign. . . . It was bad enough that the IRS would target O’Donnell with a politically motivated audit, an illegitimate lien and the public release of her private financial information. Worse than that, the misconduct in this matter inappropriately affected the outcome of a U.S. Senate election. Now, worst of all, the IRS is successfully thwarting efforts to find and prosecute illegal conduct within the agency.

So, you know, some of that “disarray” was the result of illegal dirty tricks by a corrupt bureaucracy. Just reminding people of that . . . .