I think one of the concerns some may feel over this is a political perception of domestic enemy. There's a lot of rhetoric political extremists resort to in our country today (something I never thought would be as widespread or seriously taken as it is). "Traitor" is flung at anyone who disagrees with a rival party platform.
With all the non-binding house resolutions and senate resolutions over the last five years that are filled with nothing much more than political truth or dare under the presumption that a passed or failed NBR might or might not bring public shame to a rival party or party member, I'm not surprised this binding one causes concern. Especially riding on the coat-tails of one that made a point to mention what's unacceptable behavior politically (innocent enough in itself, it seemed, as much as it assured no individual rights would be subverted).
The political terrain of this country, at present, represents a battleground waiting to transform itself to a physical reality (much like it did before the civil war). It's almost as if both parties think they're positioning chesspieces to assure the whackos on the other side are easily dealt with should the other side decide politics is no longer an option.
Sounds like a great basis for a Clancy novel. Scary part is much of Clancy's stuff ended up being somewhat prophetic.