Sinema’s switch: Betraying voters, or mirroring them?

The Arizona senator’s decision to become an independent didn’t please Democrats. But she may be in step with voters, who are increasingly unhappy with the two-party system.

In explaining her political trajectory, Arizona Sen. Kyrsten Sinema once described her younger progressive self as “the patron saint of lost causes,” saying she’d learned the hard way about the need to build diverse coalitions to get things done.

Time will tell whether her latest shift – leaving the Democratic Party to chart her own path as an independent – will be another...