Senator Harry Reid is drawing a fairly bold line in the political sand in regard to the ethical missteps surrounding Rod Blagojevich.

On Wednesday, the Majority Leader and Sen. Dick Durbin drafted a letter -- which they subsequently urged their Democratic colleagues to sign -- that calls on the Illinois Governor to not just remove himself from office but to "under no circumstance" make a last-minute appointment to fill Barack Obama's vacant Senate seat.

Should Blagojevich disregard these warnings, Reid and Durbin write, the Senate would "be forced to exercise our Constitutional authority under Article I, Section 5, to determine whether such a person should be seated."

The letter, obtained by the Huffington Post, was sent around to Democratic offices this afternoon. And it leaves very little wiggle room for potential signatories -- you either think Blagojevich should be gone or you don't.

"We write to insist that you step down as Governor of Illinois and under no circumstance make an appointment to fill the vacant Illinois Senate seat," the letter reads. "In light of your arrest yesterday on alleged federal corruption charges related to that Senate seat, any appointment by you would raise serious questions."