Found this tidbit in an article by law professor Robert Spitzer:
Myth: The Second Amendment was intended to protect the right of Americans to rise up against a tyrannical government.
This canard is repeated with disturbing frequency. The  Constitution, in Article I, allows armed citizens in militias to  "suppress Insurrections," not cause them. The Constitution defines  treason as "levying War" against the government in Article III, and the  states can ask the federal government for assistance "against domestic  Violence" under Article IV.
Our system provides peaceful means for  citizens to air grievances and change policy, from the ballot box to  the jury box to the right to peaceably assemble. If violence against an  oppressive government were somehow countenanced in the Second Amendment,  then 
Timothy McVeigh  and Lee Harvey Oswald would have been vindicated for their heinous  actions. But as constitutional scholar Roscoe Pound noted, a "legal  right of the citizen to wage war on the government is something that  cannot be admitted" because it would "defeat the whole Bill of Rights" —  including the Second Amendment.