Final answer:
Hispanic voters, African American voters, and middle-class voters are key demographics for the future of political parties due to their growing numbers in the electorate and significant impact on election outcomes.
Step-by-step explanation:
When considering which demographic is particularly key to the future of both political parties, it is critical to look at voter turnout and demographic shifts in recent elections. Based on Pew Research Center analysis, Hispanic voters have shown significant growth in the electorate since 2000 and are likely to remain a key demographic for both parties. Notably, Hispanic voters made up 11 percent of the electorate in 2020, up from previous years. The engagement and turnout of this group can have substantial implications for election outcomes.
In addition, African American voters also continue to be essential, with high turnout percentages and influential voting patterns. Past elections have shown that the support of this demographic can be crucial for electoral victory. Additionally, middle-class voters represent a broad segment of the American population and their concerns and preferences can significantly influence political campaigns and election results.