So, when Obama's "security force" comes to disarm you, you won't be equally armed and the thugs will prevail. You have the right to make that choice, but not to force it on me!
Not a popular sentiment around here, but here goes.
If the security forces come to disarm you, you will lose. If you defeat the cops, they'll bring in the Guard. If you defeat them, they'll bring in the regular Army, complete with tanks, helicopter gunships, etc.
There are very good reasons for being well armed, but the idea that a single individual or small group will thereby be enabled to take on the US government in armed combat, win the shootout and walk away isn't one of them.
You WILL lose, unless your stand leads (many) millions of others to engage in a massive revolution that overthrows the government, and/or leads the military to turn on and overthrow the government out of sympathy for your cause. As the military often has minimal sympathy for those shooting at them, I wouldn't bet on that one either.
If tens of millions of armed citizens turn out to fight, that's a very different story. But one, ten or one hundred will just be slaughtered.