Former Massachusetts Gov. Mitt Romney is expected to win all five of the Republican presidential primaries being held Tuesday. The GOP front-runner hasn't had to worry about real competition since Rick Santorum dropped out of the race earlier this month.

But former House Speaker Newt Gingrich is still running for president, even though he's short on money and lagging far back in the polls.

In his first public comments about the prostitution scandal that has engulfed the Secret Service, President Obama praised the agency and said those implicated in the scandal should not the diminish the work of everyone else.

"The Secret Service, these guys are incredible," Obama said according to Politico. "They protect me, they protect our girls... A couple of knuckleheads shouldn't detract from what they do."

A new study has determined that some automated essay graders can do as good of a job as humans. Melissa Block talks with New York Times education columnist Michael Winerip about the study and the weaknesses of automatic essay readers.

James Murdoch appeared on Tuesday before the U.K.'s Leveson inquiry, which is examining media practices. He and his father Rupert have to answer questions surrounding the phone-hacking scandal. In particular, the panel is examining the influence the world's most power media tycoon may have wielded through his political ties.

A surfer and songwriter, Ben Howard's two loves intertwined when the English surfing world became the first audience for his quiet, meditative music. At the encouragement of friends, Howard released two EPs and was soon invited to tour with Xavier Rudd. Howard is a talented artist in the vein of labelmate and influence Nick Drake, with similarly dark and soulful lyrics.

It would be easy to confuse Dr. Mitch Katz with any other doctor at the Roybal Comprehensive Health Center in East Los Angeles. His desk in a closet-sized, windowless office is littered with patient records, X-rays and cans of Diet Coke.

His everyman demeanor belies his stature. As director of the county's Department of Health Services, Katz, 52, oversees Los Angeles' public hospitals and clinics, the health care of last resort for millions of low-income Angelenos. He oversees 22,000 employees and a $3.7 billion-dollar budget.

The U.S. Department of Agriculture says it has confirmed a case of Mad Cow disease in a cow in central California. It is the fourth case found in the country in recent years.

The animal was a dairy cow and "at no time presented a risk to the food supply or human health," U.S.D.A. Chief Veterinary Officer John Clifford said in a statement.