It's doubtful. But the beauty is we'll never find out because there are 300 million guns in the hands of it's citizens.
And of course none of that matters because the bottom line is that's how the Founding Fathers saw it, and that's how the Constitution sees it.
To actually harness that power, you'd have to organize it. Think you're gonna organize 100 million people? 10 million? 1 million? Probably not, huh? How about 100,000? Very unlikely in the heat of the inevitable mass panic and confusion that would surely ensue were the government to take military action against the American people. Okay, so maybe 10,000? Okay, maybe you could actually get 10,000 people to form a coherent fighting force.
Oh yeah, right; 10,000 people ain't jack shit. And chances are you couldn't even manage that. It's hard enough trying to get a few hundred organized over something stupid and (relatively) risk free like a company party. Meanwhile, the military is already highly organized, well-trained, and armed with the best weapons and technology. They would win before the American people even knew what the hell was happening. The best you could hope for is some kind of war of attrition, and then it would be less about guns and more about the spirit, the soul, and the will to win at any cost.
The 2nd amendment is not going to help you "fight the government". Please get that through your thick heads.