Voters in Oklahoma approved a ballot measure making the state the 30th in the nation to allow broad access to medical marijuana.

The proposal, which passed by a 57% to 43% margin on Tuesday, will allow doctors to recommend cannabis for any medical condition they see fit.

Most other state medical marijuana laws delineate a specific list of diseases and disorders for which physicians can authorize patients' participation.

The approval of such a far-reaching marijuana proposal in a deeply red state like Oklahoma -- during a midterm primary election, no less -- is a clear sign of the mainstream political support that cannabis reform now enjoys.