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President Obama has embraced the billionaire investor Warren Buffett since 2008, and lately he has made use of Buffett's statement about paying a lower tax rate than his secretary pays. Now it's becoming part of the Obama re-election plan.

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ROBERT SIEGEL, HOST:

Now the return of the car. March was a good month for the auto industry. Almost all the major companies - foreign and domestic - saw their sales go up. And it was an especially good month for the car - the regular old sedan or coupe. In the U.S., cars outsold trucks by 54 to 46 percent. That's a trend that keeps going up, and it's very different from the middle of the last decade, when trucks outsold cars. To find out what's behind this trend, we turn to NPR's Sonari Glinton. Hi, Sonari.

SONARI GLINTON, BYLINE: Hi, Robert.

Hearing loss is all too common.

Some 35 million people have trouble hearing. After high blood pressure and arthritis, it's third on the list of chronic health issues for seniors.

Rick Santorum, Republican candidate for president, has suspended his campaign. From his home state of Pennsylvania and surrounded by his family, Santorum told the assembled crowd that though his race was over, the fight to defeat President Obama would continue.

America's reliance on coal to produce electricity has declined by more than 20 percent in recent years — but in 2011, the U.S. exported coal at a rate not seen in 20 years, according to the AP. And much of the new surge in coal exports comes from Asia and Europe.

Here's a rough guide to who's buying America's coal, based on the AP story:

• South Korea: Up 81 percent to more than 10 million tons.
• India: Up 65 percent, to 4.5 million tons.

The Philadelphia Police Department is adding a new tool to its crime-fighting arsenal — Twitter. Supporters say the real-time information-sharing could help police build a stronger rapport with residents and better protect them.

West Philadelphia resident Mike Van Helder remembers when police knocked down his neighbor's door at 6 a.m. "There was shouting and loud noises and of course I didn't know what it was about," Van Helder recalls. "And them being my next door neighbors, I was understandably concerned."