Three weeks ago, Cécilia Sarkozy, the glamorous wife of the French president, drew criticism here for her high-profile role in the freeing of jailed medical workers from Libya, a job some thought was best left to diplomats. Now Mrs. Sarkozy, a 49-year-old former model, is under scrutiny again, this time for ducking out of public appearances where a presidential spouse would be expected. Her latest infraction of spousal etiquette: skipping a picnic with the Bush family in New England. After accepting a rare, personal invitation to dine with President Bush and his family in Kennebunkport, Me., on Saturday, Mrs. Sarkozy...