Rudy Giuliani, the socially liberal Republican who's slipping in the polls, is reaching for an unusual E-mail list for help: a collection of 25 million Christian evangelicals. We hear that Rudy's church ally, Christian Broadcasting Network founder Pat Robertson, is making overtures to the list's owner, Alabama-based Optimum Impact. The E-mail addresses have always been available for the asking, but so far only GOP candidates Rep. Ron Paul and Mike Huckabee have made the call. But is it too late for Rudy to quiet the Huckabee surge among Christians? "Who knows?" says one evangelical leader. "But 'day late and dollar short' comes to mind."