Margaret Canovan argues that both these polar views are faulty, and has defined two main branches of modern populism worldwide ? agrarian and political ? and mapped out seven disparate sub-categories:
Agrarian
Commodity farmer movements with radical economic agendas such as the US People's Party of the late 19th century.
Subsistence peasant movements, such as the Eastern European Green Rising militias, which followed World War I.
Intellectuals who wistfully romanticize hard-working farmers and peasants and build radical agrarian movements like the Russian narodniki.
Political
Populist democracy, including calls for more political participation through reforms such as the use of popular referendums.
Politicians' populism marked by non-ideological appeals for "the people" to build a unified coalition.
http://en.wikipedia.org/wiki/Populism
Reactionary populism, such as the white backlash harvested by George Wallace.
Populist dictatorship, such as that established by Getulio Vargas in Brazil.