Republican state Sen. Doug Lamborn's fiercest opponent in the 5th District race isn't his Democratic foe. It's the Republican he's trying to succeed -- 10-term Rep. Joel Hefley. Mr. Lamborn is running neck and neck with Democrat Jay Fawcett ... Shortly after Mr. Lamborn won a six-candidate primary on Aug. 8, Mr. Hefley, who is retiring, said he would refuse to endorse the Republican candidate, pointing to what he described as his "sleazy, dishonest campaign." That stinging rebuke, coming from the highly regarded Mr. Hefley, delivered a devastating blow to Mr. Lamborn's candidacy. Several other prominent Republicans soon joined Mr....