Republican hawks say these developments amount to something less than a coordinated counteroffensive. But no one disputes that they’re nearing a critical mass of impatience with what some call “Rand-ism” – resistance to foreign entanglements and deep, confrontational skepticism about the expansion of the federal defense apparatus, particularly in the areas of surveillance and drone warfare.

“I want a strong national defense and I don’t want Rand Paul to be the face of the Republican Party,” King said in an interview. “I’ve felt this way for a while [and] once it gets out there, people say, ‘God, this is wrong, we’re killing ourselves. This is not the Republican Party.’”

Former Pennsylvania Sen. Rick Santorum, who was a vocal and at times caustic critic of Rand Paul’s father, former Texas Rep. Ron Paul, during the 2012 primaries, called it a welcome development that “people are starting to push back.”

“There was a lot of talk, particularly during the Republican primary last year, of, ‘Well, we don’t want to alienate these voters,” Santorum said, recalling that he’d been criticized as “too bellicose” and “too warlike. “I can tell you, the Paulistas who were active on the state level in 2012 were not interested in the Republican Party as it now exists. They are interested in a very different kind of model.”