A common framework for interpreting populism is known as the ideational approach: this defines "populism" as an ideology which presents "the people" as a morally good force and contrasts them against "the elite", who are portrayed as corrupt and self-serving. Populists differ in how "the people" are defined, but it can be based along class, ethnic, or national lines. Populists typically present "the elite" as comprising the political, economic, cultural, and media establishment, depicted as a homogeneous entity and accused of placing their own interests, and often the interests of other groups—such as large corporations, foreign countries, or immigrants—above the interests of "the people". Populist parties and social movements are often led by charismatic or dominant figures who present themselves as the "voice of the people". According to the ideational approach, populism is often combined with other ideologies, such as nationalism, liberalism, or socialism. Thus, populists can be found at different locations along the left–right political spectrum, and there exist both left-wing populism and right-wing populism.