Tea Party Candidates and the Role of "Outside" Groups

The GOP Has Finally Found a Way to Defeat the Tea Party (Josh Kraushaar and James Oliphant) from National Journal
"In March, McConnell told The New York Times he was going to "crush" outside conservative groups that dared to take on Senate incumbents. Tillis isn't an incumbent, but he is nonetheless an early beneficiary of the emerging establishment strategy to engage its own roster of outside groups, such as the U.S. Chamber of Commerce, in a coordinated effort to ensure that the most electable GOP candidates get nominated, especially in pivotal Senate contests."