Index of Oregon Partisan Voter Registration Ratio

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These data include statewide Oregon Democratic and Republican registration data since World War II.

The Democratic advantage increased steadily until the mid 1970s. Since that time it declined steadily until a sudden uptick in 2008.

The ratio of Democratic to Repbulican voters is one way to assess partisan strength. The index measures the ratio of Democratic voters to Republican voters.

Index = 100*(Democratic Pct./Republican Pct.)

Source of data: Oregon Secretary of State

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