Morning Edition

The senior police official investigating wrongdoing by journalists in London says there was a culture of illegal payments at the Sun tabloid to create a network of paid informants across the British government. The Sun is the second tabloid owned by Rupert Murdoch's News Corp to be the focus of wrongdoing.

Arizona and Michigan voters cast their ballots Tuesday in the Republican presidential primary. A month ago, nobody expected these states to be consequential, but it's clear that the results could dramatically change the direction of the race.

Ford is betting technology can help relieve traffic congestion around the world. In a speech Monday, Executive Chairman Bill Ford Jr. said the company is investing in systems that will bypass traffic jams, locate parking spots and communicate with other vehicles to avoid accidents.

Russia holds a presidential election this Sunday, and Prime Minister Vladimir Putin is widely expected to win. If he does, he'll return to the office he held from 2000 to 2008. Putin is the subject of the book, The Strongman: Vladimir Putin and the Struggle for Russia. David Greene talks to its author Angus Roxburgh, a journalist who once served as a public relations adviser to the Putin-run Kremlin.

Throttling is a way for the cell phone company to limit its unlimited customers. Bloomberg technology columnist Rich Jaroslovsky talks to David Greene about what AT&T has been doing to customers who use the most data.