And conservatives are not, in fact, the only ones who recognize the threat if Islamization, as this recent Pew survey shows. A higher percentage of conservatives recognize Islam's threat than liberals, that's true, but there is a significant percentage of liberals who recognize it, and a sizable percentage of conservatives who do not.
There is a bigger gap by age than by party. The older you get, the more likely you are to understand the threat to your society posed by such an intolerant and violent ideology.
But many liberals think only a conservative would be critical of Islam, and they don't want to associate themselves with something that seems like a conservative cause. Those are the people Robert Spencer was trying to reach, and we need to reach them too, in our own lives. People of all political persuasions should be united in this cause. Watch Spencer's speech here: