The act of voting in a politic election simply based on religion, sex, or ethnicity. One who practices politicism is called a politicist. Being a politicist might tie in with also being a racist or sexist.
Some people believe the reason that Oprah and Tyra supported Obama is because they were being politicist, comitting an act of politicism.
Lady: I'd vote for Obama if this were a male election but my feminist instincts tell me to go with Hilary.