It makes sense that professors with contrasting political ideologies might approach their lives in different ways. But whether a professor leans left or right, or votes Democrat or Republican, shouldn?t affect a student?s grade in Chemistry 101 or an upper-level philosophy course. Right? That?s not the case according to a recent study by two economists titled “Partisan Grading.” The paper indicates that, yes, Democratic and Republican professors do appear to grade in different ways.