Because the people that will likely win the nomination will almost certainly have big money, to include Big Pharma, behind them. Ads, research, propaganda, and aggressive ground games work, but they need money. Like multi-national corp or nation-state level money[1].
Hilary had some uncomfortable ties to Wall Street -- she was a Senator from NY, mind you -- and the DNC chair Debbie Wasserman-Schultz picked up a lot of Budweiser money by scrapping any DNC talk of Marijuana Legalization (DWS has long battle MJ Legalization in Florida, so she's been taking their money for a while, or was a sympathetic bribe for Alcohol). But I could have lived with that in exchange for working health care and sane foreign policy.
Hilary had some uncomfortable ties to Wall Street -- she was a Senator from NY, mind you -- and the DNC chair Debbie Wasserman-Schultz picked up a lot of Budweiser money by scrapping any DNC talk of Marijuana Legalization (DWS has long battle MJ Legalization in Florida, so she's been taking their money for a while, or was a sympathetic bribe for Alcohol). But I could have lived with that in exchange for working health care and sane foreign policy.
[1] see also: the russian firehose of propaganda -- https://www.rand.org/pubs/perspectives/PE198.html