Python stays far ahead after another dip; C holds second, Java retakes third from C++, and R rises to eighth as SQL slips, with Delphi steady in tenth. May’s TIOBE Index has one of those charts that ...

Re “Democrats Need to Put On a Show,” by David Plouffe (Opinion guest essay, April 7): In his essay about new ways to campaign, Mr. Plouffe offers an important analysis of the changed world of ...