By Andrew L. Jaffee

TMZ has caught Al Sharpton with his pants down — marching in NYC against “sexism, racism and homophobia in music,” but having “a history of firing off blatantly offensive slurs himself — for which he’s reportedly never apologized:”

…According to published accounts, Sharpton publicly bashed former NYC Mayor David Dinkins as “a n—-r whore,” and once referred to his political opponents as “recycled white trash.” Sharpton has also never publicly renounced his 1991 inflammatory public remarks against “diamond merchants” — after which a Harlem mob singled out a random 29-year-old Jewish rabbinical student — and stabbed him to death.

During a recent debate at the National Action Network Convention, Sean Hannity resurrected the bigoted soundbites from Sharpton’s past … which begs the question: If Imus had been armed with the same research during his face-to-face with the influential Rev, would he still have his job? Too little, too late.

Calls to Sharpton’s rep were not returned.

Er, ah… You go, Al?