Public opinion shapes party ideology by influencing how parties formulate their platforms and policies. Political parties often seek to align their values and positions with the expectations and preferences of their constituents, using polling data to gauge public sentiment. As societal issues evolve, parties adapt their ideologies to better resonate with voters, ensuring electoral support. This cyclical relationship means that shifting public opinion can lead to substantive changes in party platforms over time, reflecting the dynamic nature of political advocacy and representation.