More than two dozen major American corporations are preparing to pay climate-related taxes, departing from conservative orthodoxy and exposing divisions between the Republican Party and its business supporters.

Building on better news about the Affordable Care Act’s website, President Obama and congressional Democrats have put a new strategy into effect, spreading the word about the law’s benefits.

During a speech on the economy, President Obama explained how the health act fits into his vision for Americans’ financial security and upward mobility.

The national security agency is tracking the movements of hundreds of millions of cellphones in an effort to find suspicious travel patterns or activities by intelligence targets, according to documents leaked by Edward J. Snowden.

After surveillance by the National Security Agency, major Internet companies like Microsoft and Yahoo have moved to strengthen protections of users’ data.

John D. Apel had been barred from an Air Force base after convictions for vandalism and trespass, but he said those orders should not apply to an area open to the public on the other side of a green line.

Vice President Joseph R. Biden Jr. raised the issue as beijing withholds accreditation for journalists from The New York Times and Bloomberg.

The Evangelical Immigration Table, a coalition of 11 Christian organizations and churches, will run radio commercials in English and Spanish calling for prayers for Speaker John A. Boehner to take up legislation on immigration.