Chaos in Iowa shines spotlight on progressive tech start-up Shadow

The delayed result from the Iowa Democratic caucus in the US has put the spotlight on a start-up called Shadow, which is part of a wider effort by veterans of Hillary Clinton’s 2016 campaign to boost the party’s use of technology.

While there has been no official explanation of the problems that befell the start of the Democratic presidential race, a number of precincts in Iowa had problems reporting their vote count through an app built by Shadow, and a back-up plan to report counts by phone was delayed when...