Republicans in Sussex County are becoming slightly nervous over the re-election prospects of longtime Sheriff Robert Untig, who may face an aggressive — and possibly well-financed — challenge from a career law enforcement officer with close ties to the Bergen County Democratic fundraising machine. Untig, in office since 1991, has taken some heat recently for his decision to retire from the New Jersey police pension system, so that he can draw a pension while continuing to earn nearly $100,000 as the full-time Sheriff. The incumbent has already attracted two Republican primary challengers, Franklin Councilman Jack Stoll, who is a Sussex County Sheriff’s officer, and Mount Olive Police detective Mike Strada. Democrat Wayne Yahm has spent twelve years on the Franklin Board of Education, and 25 years as a Bergen County Sheriff’s officer. A captain, he now runs the Bureau of Crime Scene Investigation and Detective Units. Bergen County Sheriff Leo McGuire endorsed Yahm at his announcement earlier this month.