GOP lawmakers targeted Tea Party primary challengers as tax cheats
I know Lugar did:
"...In its ad, the AAN claims “Mourdock took an illegal tax break three years straight even after repeated warnings.” And an ad from the Lugar campaign, released just ahead of Tax Day, claims that for years, Mourdock “received $45,000 in illegal second homestead tax deductions.”
Why isn't it possible that Bush's appointee was targeting Tea Party leaders for preferred GOP establishment candidates?
Mitch McConnell Had Previously Floated Karl Rove Idea To Target Weak Tea Party Candidates
http://www.huffingtonpost.com/2013/02/09/mitch-mcconnell-karl-rove_n_2652927.html
WASHINGTON -- A firestorm on the right has greeted a new Karl Rove-backed super PAC aimed at knocking off weak conservative Senate candidates and protecting strong incumbents in GOP primaries, but the new PAC may well prove to be a plus in the eyes of Senate Minority Leader Mitch McConnell.
That’s not surprising: The model for the new super PAC, dubbed the Conservative Victory Project, is akin to one that McConnell has touted the need for at GOP events in recent years, two GOP fundraisers with good ties to the senator told Huffington Post. Both asked for anonymity to speak candidly about private events and discussions.
The two fundraisers explained that McConnell has several times lamented that, in the last two elections, weaker and unelectable Tea Party candidates have been winning more GOP primary battles, often with hefty financing from right-leaning groups like the Club for Growth. In some cases, the weaker candidates have also been backed by Democratic groups seeking to boost their own party’s prospects in the fall elections.
And the result wasn’t pretty for the GOP in either cycle. In 2012, two GOP Senate candidates with Tea Party backing lost their races last fall in Missouri and Indiana, helping Democrats expand their Senate majority. In the case of Missouri, McConnell strongly condemned Tea Party favorite Todd Akin for his incendiary comments about “legitimate rape,” and sent signals that Akin should consider dropping out before a candidate deadline passed last fall to avoid a debacle on Election Day. In 2010, Tea Party candidates in Delaware and Nevada lost races that more moderate Republicans may have been able to take.>>>
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Especially since IRS head was appointed by Bush then McConnell probably could have requested this. Tea Party candidates who couldn't be elected. 
