Well regardless of your politics, not even touching Imbroglios.
The Homeland Security act is designed just for this type of thing.
Hence, there has been a Command setup in DoD for the Continental United States.
The Rand paper available on this website (www.rand.org) details the wargames held in a theoretical War on Terror and how in the fighting of the war it may become necessary to suspend Posse Comitatus.
So in my mind it is not a question of "If" we will see United States Forces operating within CONUS, but "When".
The paper outlines and gives a blueprint to exactly every measure we have seen the US Gov. do up to this point.
As far as politics, well.... Tough questions.
With reasonable and wise men in office then I wouldn't have too much trouble in Times of War of having US troops on American soil. However, the US hasn't always had Reasonable or Wise leaders nor will they always have them.
At this time with this administration I, speaking for myself only, would not have too much trouble with them Conducting operations within the CONUS. I see the reasons and I see the dangers. This situation in which the US finds itself would merit this approach. Only from that position would I support this.