As you may know, conservative Erik Rush - one of Sean Hannity's designated African American black attackers - tweeted shortly after the Boston Marathon bombings that Muslims are "evil." "Let's kill them all." After Right Wing Watch exposed him, Rush claimed he was being sarcastic. But a new column from him shows otherwise.

Rush's column is full of hate toward Muslims and liberals, then concludes with the following:

For the record, I still maintain that Islam is, by its nature, wholly incompatible with Western society. I analogize liberalism, which is promoting this dhimmitude, to Stage 3 cancer in America’s body politic. For the record: While killing people is definitely undesirable, that is what war tends to be about.

And we are at war – just study the history of Islam, or ask any Islamist.

Rush is not as regular a Fox News guest as, say, Ann Coulter, but Right Wing Watch did the math:

A transcript search reveals that he’s appeared on Fox nearly 20 times and has made additional appearances on Fox News Radio, as recently as last Friday. Hannity’s website even features a review for Rush’s book, with the catchy name of Negrophilia.

Right Wing Watch has a petition demanding that Fox stop putting him on the air as a credible voice of conservatism or any other view. I don't normally advocate for taking people off the air, but in this case it's deserved.

Screen grab of the tweet (now removed) via Right Wing Watch.