We need a common enemy to unite us.

Often people are united, not as much for the sake of truth, as for the enemy that is common.

talked about our common struggle against terrorism.

We will continue to work together in our common fight against terror.

Nothing binds a people to their leader like a common enemy. Voters don't change governments during war.

The advantage to fighting the evils that are in plain sight is the fact that it is quite easy to win-over the "opposition".