I think linking Nazis/Hitler with Jihad/Terrorists is very effective. Nazis are almost universally accepted as most evil and are most easily recognized as an enemy worth defeating with high costs.
+Prevent the second Holocaust by defeating Jihad.
+Hitler killed 6 Million Jews within years.
Ahmadinejad wants to nuke 6 Million Jews within seconds.
+Jihad is Nazism for bearded people
+Islamic Terrorists are Nazis without fashion sense
Some other:
+Terrorists will kill liberals first
+We didn't surrender after Pearl Harbor.
Why surrender after 9/11?
Cool, how about we shrink some...I like "Prevent a Holocaust, Defeat Jihadism" and "Terrorists Are Nazis W/O Jack Boots"?