NYT's US News (Video)

State, local and federal officials give details on how a 24-year-old suspect entered a Colorado theater, killed 12 and injured dozens.

The campaign turns nasty | John Harwood caught in the crossfire | The Virginia Senate race | Terry McAuliffe | The Op-Ed columnists Charles Blow and Gail Collins on vice-presidential books.

Mark Leibovich on ‘The Macker.’

The Bronx River was once among the most polluted waterways in America. Now a new generation is discovering and helping to save it. Michael Kimmelman, architecture critic, tours the river.

The latest hints. | Trying to break the story. | Christie out of the running. | Campaign ad sniping goes on. | A report from a gathering of Mormons.

As a single mother of three, Jessica Schairer falls in the middle of a sharp debate about how economic inequality is increasingly linked to changes in family structure.

The Obama campaign focuses its attacks. | An interview with a Republican leader in the House. | Romney opens up a fund-raising lead. | A political Twitter voice you should be following.

Lukas Wartman, a leukemia doctor and researcher, developed the disease himself. As he faced death, his colleagues sequenced his cancer genome. The result was a totally unexpected treatment.

Republicans react to a shift in position from the Romney campaign. | Looking ahead to Friday’s jobs report. | A preview of a Sunday Magazine profile of the pro-Obama ‘super PAC.’

A confused response to the ruling | Rob Portman as a leading vice-presidential candidate | Romney takes a few days of vacation.