A gay Republican group that vehemently opposes President Bush’s attempts to ban same-sex marriage has hired a top lobbying firm to back an administration effort it does support, Social Security private accounts. The Log Cabin Republicans, an anti-tax, gay-rights group whose name references the type of domicile where Abraham Lincoln, a Republican, was born, recently hired powerhouse lobbying shop Van Scoyoc Associates, according to recent lobbying disclosure reports. While the group has existed since the 1970s, it has not registered to lobby in recent years, choosing instead to focus on grassroots efforts to build support among gays and lesbians for...