catbird seat

Etymology
The expression may originate in regard to the, as it was in use in the 19th century in the southern United States. It was featured in the 1942 short story "The Catbird Seat" by, and popularized by baseball commentator , and often referred to baseball. The expression, according to James Thurber, comes from the observation of the catbird (an Australian bird) of the family. Some of the male birds will assemble several hundred colored rocks or shells, arranging them in a remarkable artistic display, in order to build a "seat" atop which his mate will eventually be enthroned.

Noun

 * 1)  An enviable position, often one of great advantage.
 * With a big victory in the primary, he was sitting in the catbird seat.