Democratic Party only cares about money

I realize that's no surprise and not news. But the Dem Party keeps putting up corporate candidates who get their full support while progressive candidates are shunned with every effort in the Party to defeat them. And the evidence is clear then when a corporate Dem goes up against a corporate Republican the latter most always wins. So why do they do it? Follow the money. If you put a corporate candidate up then corporations pour in the money. Basically the Dem Party has sold their soul to the devil for money and the people be damned. Why progressives keep running as Democrats is beyond me when they stand a far better chance running as independents.