TLDR: Vox treats a simple majority as an overwhelming majority, when in the former case almost as many people "win" as "lose". If you change the benchmark to 75%, the affluent get their way twice as often with policies they support and are successful at stopping nearly all policies that they're strongly against. Strong support among high-income Americans roughly doubles the probability that a policy will be adopted; strong support among the middle class has essentially no effect.
PS: I also find it kind of ridiculous to put the affluent and the middle class on an equal playing ground like Vox does, given that the latter is so much larger than the former. Even if Vox is right it's still really bad.
Here's a reddit comment explaining what the Vox article gets wrong
TLDR: Vox treats a simple majority as an overwhelming majority, when in the former case almost as many people "win" as "lose". If you change the benchmark to 75%, the affluent get their way twice as often with policies they support and are successful at stopping nearly all policies that they're strongly against. Strong support among high-income Americans roughly doubles the probability that a policy will be adopted; strong support among the middle class has essentially no effect.
PS: I also find it kind of ridiculous to put the affluent and the middle class on an equal playing ground like Vox does, given that the latter is so much larger than the former. Even if Vox is right it's still really bad.