"I have never seen something that resonated with so many people in so many parts of society because it made so much sense," Manchin said. "When something makes that much sense, you have facts to back you up, and you just have to walk out into your community and explain it."

Understanding the mentality of senators, Manchin quipped, was much harder than understanding gun owners. But he implicitly rejected President Obama's angry condemnation of senators who opposed the plan Manchin hatched with Republican Senator Pat Toomey as "shameful." To Manchin, the calculation that red-state Democrats who voted against the bill made -- including Mark Pryor of Arkansas, Mark Begich of Alaska, Heidi Heitkamp of North Dakota, and Max Baucus of Montana -- was rational and understandable, even if he disagreed.

There was more castigation, however gentle, for New York Mayor Michael Bloomberg, whose group Mayors Against Illegal Guns has targeted Democrats, and his allies. It's important to consider the way a red-state senator would view the situation, Manchin said, and it makes more sense to help rally support among constituents -- to create a "permission structure," as Obama might say -- so that the senators can switch their votes.

"If you were in a state such as West Virginia or North Dakota or Arkansas, which is a rural state and it's mostly gone red in national elections, how would you approach that? Would you say, 'I'm going to beat Joe Manchin up because he didn't vote the way he should have?'" Manchin asked. "Or would you say, 'I'm going to appeal to law-abding gun owners in the state,' and give me enough support from my constituents that I don't have to do hand-to-hand combat with?"

There's little profit in attacking a senator once the vote is made, he said -- especially if, like the retiring Baucus or the newly reelected Manchin, the official won't face voters for six more years or ever again. "If you beat me up now, I'm going to hunker back and defend my position. I've already made my vote! Right or wrong, I made my decision," he said. "Don't back me up against a wall."

But Manchin remains optimistic about the chances to pass the law. Although Toomey has appeared publicly unenthusiastic about a second attempt, Manchin insisted that the conservative Pennsylvanian would be on board and still supports the compromise. The nation will know soon enough whether campaigners are able to put Manchin's ideas into use -- and whether that strategy is enough to pass the first major gun legislation in two decades.