Here.
Makes sense, right? Certain conservative individuals and groups have been harassed by the Internal Revenue Service for their political views. The IRS is a a branch of the U. S. government whose president is Barack Obama, a man who is half-black and half-white, and therefore black. Those who criticize the targeting of conservatives by the IRS are criticizing the president. But to criticize a black president for anything is racist. It is the equivalent of applying 'nigger' to him. Therefore 'IRS' is a conservative 'dog whistle' for 'nigger.'
Thus 'reasons' the liberal.
Am I using 'nigger' or mentioning it? The latter. It is an important distinction. Philosophers are careful to observe it. It is one thing to use a word to refer to someone or something, and quite another to talk about, or mention, the word. Boston is a city; 'Boston' is not: no word is a city. 'Boston' is disyllabic; Boston is not: no city is composed of two syllables. Same with 'nigger.' It's a disyllabic word, an offensive word, a word that a decent person does not use. I am not using it; I am mentioning it, talking about it to make a serious point.
Those who refuse to write out 'nigger' but have no qualms about other such offensive epithets as 'kike' employ a double standard. It is also ironic that one should be squeamish about writing out 'nigger' when one has no qualms about slandering conservatives in the most malevolent and scurrilous ways.