Commentary: Democrats should really shut up about packing the Supreme Court

For several months, the left wing of the Democratic Party has been flirting with the idea of increasing the size of the Supreme Court if Democrats gain control of Congress and the presidency in 2020.

Now the idea of "packing the court" (as President Franklin D. Roosevelt tried to do in the 1930s) has attracted the interest if not necessarily the endorsement of some Democratic presidential hopefuls.