[jfengel]

They have whatever power the Supreme Court decides they have. The Supreme Court decided that was their job, and thus far everyone has accepted it. The Court interprets the Constitution, which is vague enough to mean whatever a bare majority wishes it to mean.

[danny_codes]

> and thus far everyone has accepted it

For now. SC is becoming more partisan, which causes SC's credibility to decline. I assume there's a point where SC loses too much credibility and the existing system of balancing power breaks down.