Since the election numerous critics of the left, some from the left and some not, have identified "identity politics" as a culprit in Democratic political failure and the election of Donald Trump. Identity politics is a great term for this because it, ironically, covers up more than it reveals.
Best I can tell, identity politics just means that religious, ethnic and sexual minorities, largely through the Democratic party or left of center political movements, make the case for equal and dignified treatment in society. This should not be controversial, but it apparently is.