why is it an assumption that only the republican party will be affected by a third party.

It most certainly is not a given that all democrats who voted for Obama the first time will do so if there is an option like a third party.

It is also most certainly not a given to assume that all democrats are satisfied with the direction and actions of their party.

And the party faithful will do what they have to do on both sides whether they are happy with the results or not.

btk