The last time an elected U.S. senator from Minnesota resigned, DFLers botched the resulting appointment so badly that they were swept out of power in the state for years.
It became known as the 1978 "Minnesota Massacre," when DFLers lost both U.S. Senate seats, the governor's office and dozens of seats in the Legislature.
"It was probably the worst defeat the DFL ever suffered, certainly in modern political times, in Minnesota," said Roger Moe, who was a DFL state senator at the time.
Other factors helped topple Minnesota DFLers in that election, but underpinning it all was voter backlash against the Senate appointment.
The series of events began when Walter Mondale was elected vice president in 1976. Mondale was a U.S. senator at the time, so he resigned his seat in late December 1976, a few weeks before being sworn in to his new post. That handed the DFL governor, Wendell Anderson, a political plum — the chance to appoint a replacement.
The immensely popular Anderson was fresh off a smashing re-election victory in 1974, when he buried his Republican opponent by 33 percentage points and won all 87 counties.
"I think he saw his avenue to follow in the footsteps of Humphrey and Mondale, and maybe bigger things," Moe said.
In a monumental miscalculation, Anderson essentially appointed himself to the vacant Senate seat.