Hiding The Real Bush Views--At the Convention, And On The Blog
The most common assumption is that they are afraid of liberal dissent, but in reality they have far more to fear what their own supporters would write about. This might spill the beans, and let the general public know how extreme the current Republican Party has become under George Bush.
Presumably, if Bush supporter were allowed to comment on the campaign's blog, we would see the same type of discussion as is present on other conservative boards, and what we often see from trolls on liberal blogs.
When discussing foreign policy, we would see Bush supporters excited about the prospect of a more interventionist foreign policy, with Bush supporters excited about going into countries such as Iran, and maybe even Saudi Arabia, in a second term. So much for pretending their foreign policy is based upon fighting terrorism.
Getting to domestic policy, we would see the excitement from Bush supporters over how Bush's proposals for Social Security and Medicare would finally kill off these programs as we know them. So much for compassionate conservatism.
Undoubtedly we would also see the argument going around in conservative circles that separation of church and state is a myth. Even some traditionalist conservatives, who respect the principles this country was founded upon, might become a bit nervous over some of the views which are commonplace among Bush's supporters, and key advisors.