HARTFORD, Conn., Aug. 3 -- Democratic challenger Ned Lamont, riding strong antiwar sentiment, has surged to a significant lead over embattled Sen. Joseph I. Lieberman (D-Conn.) heading into Tuesday's Senate primary, according to a Quinnipiac University poll released here Thursday. The poll showed Lamont ahead of Lieberman by 54 percent to 41 percent, underscoring the challenger's clear advantage. Facing a likely defeat, Lieberman has scrapped plans for a massive and costly get-out-the-vote operation on primary day, according to several Democratic sources. Instead, he will shift some of his resources into more television commercials designed to highlight his accomplishments for the...