Super Tuesday brings a supersized election security challenge

Millions of voters across the country will cast ballots during Super Tuesday on old, insecure election equipment — even after nearly four years of handwringing and warnings about Russian election interference.

The jurisdictions at risk include three of Tennessee’s biggest counties — Shelby, Knox and Rutherford — where the paperless voting machines at the polls will include devices with security flaws so alarming that voters tried suing to have the equipment removed from precincts. Dozens of small counties in Texas are also sticking with risky touchscreen machines that have no...