House insiders say a handful of House Republicans cursed Cruz in the cloakroom on Wednesday, and a leadership source says angry e-mails were exchanged among GOP staffers who consider Cruz to be a charlatan. “Cruz keeps raising conservatives’ hopes, and then, when we give him what he wants, he doesn’t have a plan to follow through,” an aide fumes. “He’s an amateur.” Another aide says, “Nancy Pelosi is more well-liked around here.”

Cruz, however, tells me House Republicans are wrong to be infuriated. In an interview, he says his goal was never to whip together votes in the Senate for a defunding bill; it was always to inspire a grassroots uprising that would rattle Congress and President Obama, and hopefully defund Obamacare.

“I’m convinced there is a new paradigm in politics — the rise of the grassroots,” Cruz says. He cites Senator Rand Paul’s filibuster on drone policy, and the debates on Syria and gun control, as recent examples of how an “overwhelming” number of phone calls and e-mails from constituents can force the president to buckle.

“And on Obamacare, I’ve said, from the start, that if typical Washington rules apply, we can’t win this fight,” he explains.