(Photo courtesy of Collection of the Supreme Court of the United States)

U.S. Supreme Court justices.

Judges are supposed to be impartial. But because they’re human beings, they occasionally bring their own thoughts and maybe even biases to a case every now and then. Even U.S. Supreme Court Justices can be affected — they are selected and approved by politicians, after all.

But a recent paper put together by law professors Tonja Jacobi of Northwestern University and Matthew Sag of Loyola University says the issue of justices acting as advocates is a growing trend.

The paper, published in The Notre Dame Law Review, is titled "The New Oral Argument: Justices as Advocates."