WP Issues CRM offers multiple approaches to classifying and retrieving constituents and activities.
Most importantly, you have all the flexibility that WordPress offers to tag and categorize posts. The advanced search shown below would retrieve all constituents with a home address in Boston who had sent two or more emails about any issue classified under any sub-category under the environment category since January 1, 2016.
Additionally, you can create custom fields for constituents, including drop down fields with option sets that you define. For example, you could add a “Party” field and classify voters by party. (The party field is built-in in recent versions of WP Issues CRM).