I suggest Ed Schultz
Actually, it's pretty pointless to look around for a left-wing "equivalent" of Michelle Malkin.
In this entire lifetime, which has not been exactly short, columnists considered "conservative" have been pretty mild and measured in their rhetoric, while columnists considered "liberal" have been rabid and inflammatory.
Cal Thomas, for example, is nothing, nothing at all, when compared with the late Molly Ivins, when it comes to being harsh and judgemental and intolerant and hateful towards the other side.
Just as there is no right-wing equivalent of Anthony Lewis, Maureen Dowd, Paul Krugman, Thomas Oliphant, Jonathan Chait, that Mark guy in San Francisco, Sulzberger Jr. of the
New York Times, Ellen Goodman, Ann Quinlan, Nina Totenberg, Thomas Friedman, &c., &c., &c., and their constant irritating name-calling and labeling and slandering, there is no left-wing equivalent of columnists who consider all the facts, balance their judgement, and refrain from inflammatory rhetoric.
It's like comparing an orange with a penquin.