Tea Party organizations have been aggressively attacking Cochran for saying that he didn't know a lot about the tea party. Tea Party Express went on to compare Cochran to Lugar, who was defeated by Indiana state Treasurer Richard Mourdock in the 2012 GOP Senate primary before Mourdock went on to lose to now Sen. Joe Donnelly (D-IN) in the general election.
"Instead, he has remained defiant and even dismissive of the Tea Party movement," the email continued. "This strategy didn't work for former Senator Dick Lugar of Nebraska, and it will not work for Senator Cochran!"
A number of incumbent Republicans have been made to watch their right flank this cycle due to tea party challenges, among them Senate Minority Leader Mitch McConnell (R-KY) and Sen. Pat Roberts (R-KS).
The Tea Party Express email concluded by likening McDaniel to Sen. Ted Cruz (R-TX) or Sen. Mike Lee (R-UT).
"He is a true Tea Party conservative firebrand cut from the same cloth as Ted Cruz, Mike Lee, and Rand Paul," the email read. "The aforementioned have served us admirably, but it is clear that they need reinforcements. "
This post was updated.