Key backers of the Senate immigration bill said yesterday they are willing to consider a compromise that would delay the guest-worker program and "amnesty" portions until the borders have been secured. The proposal was floated by Senate Judiciary Chairman Arlen Specter in an interview Monday with editors and reporters at The Washington Times. "I think it's worth discussing," said Sen. John McCain, Arizona Republican. "Many of us have said we could work on border enforcement and, at the same time, work on other aspects that would take more time." Sen. Edward M. Kennedy, Massachusetts Democrat, said a delay will occur...