Profit. It takes a lot of money to run for and win an elected position, so in order to raise this money they need to take campaign contributions, and people who take contributions from more profitable industries and companies will have a better chance of winning their election. This is legal due to Citizens United (look that up)
Industries like Oil or Healthcare insurance make a lot more profit than green tech etc. So they can have a greater influence on politics.
And furthermore, companies that are typically competitors, e.g. different insurance companies now suddenly have a shared interest when faced with possible legislation that would impact their profits.
So the entire industry can react together and present a much more unified front that basically prevents any change that would affect the profit margins of a significant sector of an industry.
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