THOMAS EDSALL: Has the Democratic Party Gotten Too Rich for Its Own Good?

In days past, a proposal to slam the rich to reward the working and middle classes meant hitting Republicans to benefit Democrats.

Even as recently as 1976, according to data from American National Election Studies, the most affluent voters, the top 5 percent, were solidly in the Republican camp, 77-23. Those in the bottom third of the income distribution were solidly Democratic, 64-36.

In other words, 41 years ago, the year Jimmy Carter won the presidency, the Sanders proposal would have made political sense.

But what about now?

In the 2016 election, the economic elite was essentially half Democratic, according to exit polls: Those in the top 10 percent of the income distribution voted 47 percent for Clinton and 46 percent for Trump. Half the voters Sanders would hit hardest are members of the party from which he sought the nomination.

The problem for the Democratic Party is that “them” has become “us.”

Democrats need to ask themselves how that happened.