A group of Republican senators led by Mike Lee have signed an open letter promising to vote down any continuing resolution that contains funding to implement the Affordable Care Act. Essentially, they’ve threatened to shut down the federal government unless Obamacare is repealed, or at least defunded. Besides Lee, Marco Rubio (R–FL) and John Thune (R–SD) have signed the letter, along with an undisclosed but ostensibly large number of fellow conservatives in the Senate. The putative reason for this scorched-earth opposition is the delay of the employer mandate, which Lee et al see as proof that the Affordable Care Act cannot work as written. That delay in enforcing Obamacare was too much for the senators who are committed to repealing Obamacare, apparently. Full text of the letter after the jump.