The key part of the article is this section here
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In marshaling their financial resources chiefly behind Republican candidates, the donors are also serving as a kind of financial check on demographic forces that have been nudging the electorate toward support for the Democratic Party and its economic policies. Two-thirds of Americans support higher taxes on those earning $1 million or more a year, according to a June New York Times/CBS News poll, while six in 10 favor more government intervention to reduce the gap between the rich and the poor. According to the Pew Research Center, nearly seven in 10 favor preserving Social Security and Medicare benefits as they are...
“The campaign finance system is now a countervailing force to the way the actual voters of the country are evolving and the policies they want"