The book provides a detailed analysis of electoral districts in Canada. It focuses on the specific outcomes and shifts in the 2004 and 2006 federal general elections, offering a riding-by-riding breakdown. The work aims to offer a comprehensive overview of the electoral landscape and the factors influencing results at the local level.

This supplement appears to be a specialized resource for those closely following Canadian federal elections. Its focus on a riding-by-riding analysis suggests it serves as a detailed reference for political scientists, journalists, and engaged citizens. The inclusion of data from two recent elections indicates its utility for understanding immediate electoral shifts and patterns.