He's the only openly atheist member of Congress.  He refused to apolgize after announcing that he had "no respect for" the commander in chief, George W. Bush or the generals who were sending young people to Iraq "to get their heads blown off for the presidents amusement." He called one of his colleagues a "whore for the insurance industry." The mainstream press refers to these statements as "gaffes."  But really, foul-mouthed as he can be , much of what he says is true.
And now he's finally called out the anti-immigration nuts.  They don't make congressmembers like this any more.