Christy Evans, formerly a top staffer to then-whip Newt Gingrich, is a registered lobbyist for Tiffany’s, the high-end jeweler where Gingrich and his wife enjoy an extraordinary line of credit.

Evans, former floor assistant to Gingrich and now a lobbyist at the legendary K Street firm Cassidy & Associates, has represented Tiffany’s on mining issues since 2000, according to lobbying filings. The Gingriches have benefitted from a $250,000 line of credit at Tiffany’s — essentially an interest-free loan.