In 2017 polls in same 5 states, key national & regional parties spent over Rs 300 crore on publicity. But, it seems that digital ad spends aren’t a big part of this expense head.
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https://theprint.in/politics/in-post-covid-age-of-digital-campaigns-parties-spent-just-rs-8-crore-in-3-months-on-facebook/824940/