Don't do it Clinton, Obama & Edwards; don't sign the Four State Pledge Letter 2008. (UPDATED SATURDAY & AGAIN SUNDAY)

Regardless of the merits, regardless of who is right or wrong, don't make a mistake and sign the Four State Pledge Letter 2008 as Richardson has done and Biden has indicated he would do. I predict there will be no upside, and much downside, to doing so.
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From TIME:

Having failed thus far to corral Florida and Michigan behind the Feb. 5 "window," Democratic officials from Iowa, Nevada, New Hampshire and South Carolina are putting new pressure on the candidates themselves to bring "this uncertainty (and potential chaos) to an end" by refusing to campaign in those states.
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UPDATE ON SATURDAY:

TIME reports that John Edwards on Saturday joined Chris Dodd, Bill Richardson and Joe Biden in saying he plans to skip states that break party rules by holding early primaries, that is, a primary before February 5.

I think this mess is something that the party and maybe the courts are going to have to work out, and it is not fair to expect and pressure the candidates to participate in resolving. This is an easier decision for candidates who lack the resources to campaign in the bigger states.

For Edwards the timing is unfortunate. He was just beginning to get more traction and favorable media coverage. As I noted yesterday, I don't see the upside and there is at least the possibility of much downside from voters in Florida and Michigan.
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UPDATE ON SUNDAY:

According to The Washington Post, Clinton and Obama joined Edwards in signing the pledge on Saturday.