3/3
It’s imperative to distinguish Pence’s responsibilities from those of the other three. Conway, Spicer and Sanders are all members of the president’s staff. He hired them to lie for him and to him; they knew that going in and they have all tried to fulfill that mandate, and they have sacrificed their reputations in the process; they will never fully rid themselves of the stench of Trump. Conway will be remembered in her obituary for “alternative facts” and Spicer will always be Melissa McCarthy driving the White House podium into the reporters in the briefing room. Sanders may be able to save her reputation if she bails now.
But Pence is NOT a member of the president’s staff.  He’s an elected constitutional officer whose oath obliges him to support and defend the Constitution -- not the president.  Co-operating with the president in the attempt to deceive the people of the United States, and making excuses for him when he does, is not part of the job.