It's not dead yet, though the enemies on the right and the left have severely wounded it. And a LOT of damage has been done by the guardians of the Constitution, the Federal Courts.

My favorite part?
It's the part "they've" already killed, the Tenth amendment.

Amendment X
The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.

Irony?