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Automatic detection of speaker states and traits is made more difficult by intergroup differences in how they are distributed and expressed in speech and language. In this study, we explore various deep learning architectures for incorporating demographic information into the classification task. We find that early and late fusion of demographic information both improve performance on the task of personality recognition, and a multitask learning model, which performs best, also significantly improves deception detection accuracy. Our findings establish a new state-of-the-art for personality recognition and deception detection on the CXD corpus, and suggest new best practices for mitigating intergroup differences to improve speaker state and trait recognition.