Rumors are that Barack Obama will announce Hillary Clinton as his secretary of state soon.

But The Washington Post writes that the U.S. Constitution might be standing in her way.

The Constitution forbids a member of Congress from becoming a cabinet member if the salary of the cabinet member was raised during the member’s time in Congress.

In Clinton’s case, during her current term in the Senate, which began in January 2007, cabinet salaries were increased from $186,600 to $191,300.

President Nixon got around the Constitution in the “The Saxbe Fix” in 1973 when he nominated Sen. William Saxbe as attorney general, though the AG’s salary had been raised during Saxbe’s time in the Senate. Saxbe instead took the a lower, pre-1969 salary.

But Democrats in the past have inveighed against this sleight-of-hand. In the Saxbe case, 10 senators, all Democrats, voted against the ploy on constitutional grounds. Sen. Robert C. Byrd (D-W.Va.), the only one of them who remains in the Senate, said at the time that the Constitution was explicit and “we should not delude the American people into thinking a way can be found around the constitutional obstacle.”

Call it the Hillary Amendment?