In the context of United States political ideology, demographic influences play a critical role in shaping the political attitudes and behaviors of different groups. As demographic compositions change, so do the political landscapes influenced by factors such as age, race, ethnicity, religion, and socioeconomic status. In recent years, scholars have observed distinctive voting patterns across various demographic subgroups, particularly in presidential elections. Which of the following demographic trends is most commonly associated with a shift toward Democratic Party support in the last two decades?