Identity isn't everything -- how far do demographics take us towards self-identified party ID?

How well do demographics explain party identification? Demographics are related to party identification in political polls, news articles, and academic publications. Yet, there is a diversity of party identification even within demographic groups which have historically been attached to one party. And some groups lack a clear connection to either party. It may be that demographics on their own fail to account for the fact that people generally belong to a variety of groups. They must select the groups which are most important to them when shaping a political identity, and may choose to construct an identity relatively unattached to any specific demographic group to which they belong. This prompts the question, do we need to consider measures of identity strength when using demographics to explain party identification? We utilize a predictive framework to address these questions and find that demographics are highly predictive for some groups (e.g., Black Democrats), while others benefit from the inclusion of identity strength (e.g., Hispanic Republicans).