(photo: Gage Skidmore/flickr)

Jon Huntsman threw in the towel this evening.

Jon M. Huntsman Jr. informed his advisers on Sunday that he intends to drop out of the Republican presidential race, ending his candidacy a week before he had hoped to revive his campaign in the South Carolina primary.

Mr. Huntsman, who had struggled to live up to the soaring expectations of his candidacy, made plans to make an announcement as early as Monday. He had been set to participate in an evening debate in Myrtle Beach.

He had just received the endorsement of the largest newspaper in the state, as dday presciently put it:

Jon Huntsman got the endorsement of the largest newspaper in South Carolina, by the way. And I’m sure this will continue the unerring accuracy of newspaper endorsements.

Apparently he decided “days ago” to give it up:

Huntsman decided “days ago” — shortly after the New Hampshire primary — that he would not go on with his campaign, according to a high-level source close to the campaign.

Senior staffers in South Carolina say the campaign struggled to get Huntsman to campaign in the state following his third-place finish in New Hampshire. They say the campaign had no infrastructure in the state and suffered from lack of resources and communication issues. Not even signs had arrived yet from New Hampshire. Many volunteers had no work assigned to them.

Drip. Drip. Drip.

The South Carolina primary is this Saturday (polls close at 7pm ET), and there are two debates this week, Monday and Thursday evenings.

Stay tuned.