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The 3-year-old champion colt named Hansen will not be the favorite in the Derby Saturday, but most eyes will unavoidably be upon him.

You see, in a field of chestnuts and bays, Hansen is already brilliant white. Well, technically he's a gray, but without boring you with equine pigmentation detail, thoroughbred grays — like the great Native Dancer — turn whiter as they grow older, and Hansen is simply prematurely white, sort of a four-legged Steve Martin.

If the prosecution at the Roger Clemens perjury trial hoped for a dramatic showdown on Tuesday, the day was a big disappointment. The prosecution's star witness, Clemens' friend and onetime pitching ace Andy Pettitte, provided as much, if not more, ammunition for the defense.

Clemens is charged with lying to Congress when he testified that he had never used performance-enhancing drugs.

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From NPR News, this is ALL THINGS CONSIDERED. I'm Robert Siegel.

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President Obama flew to Afghanistan today and signed a historic agreement on the future of the U.S. involvement in that country. The president traveled under tight security to Kabul and met with Afghan President Hamid Karzai for a signing ceremony at the palace there.

This week, the U.S. Census Bureau announced that in the first quarter of 2012, the American homeownership rate hit its lowest level in 15 years. During the housing boom, millions more Americans bought homes, bumping the rate to nearly 70 percent. Now, that buying spree has been replaced with millions of foreclosures, and most of those gains have been lost.

In the tight U.S. Senate race in Massachusetts, Democrat Elizabeth Warren has been playing defense because of allegations that she used her Native American heritage to advance her career.

Warren, the likely Democratic challenger to incumbent Republican Scott Brown, says she did not know that Harvard Law School touted her as a member of a minority group back in the 1990s, when the school's faculty came under criticism for being too white.

But Warren says that when she was growing up in Oklahoma, her family always told her that she's part Cherokee.

Europe's economic crisis has been driving leaders from power, one after another. Among those toppled was George Papandreou, who stepped down as the prime minister of Greece last November, just two years into his government's four-year term.

Richard Grenell, a long time Republican hired by Mitt Romney's campaign as a foreign policy spokesman, resigned today. Grenell's hiring made news less than two weeks ago, because Grenell is openly gay.

The New York Times reports Grenell's abrupt resignation comes after he came "under attack by antigay activists in the party."

The Romney campaign cofirmed his resignation saying they were "disappointed" Grenell had resigned for "personal reasons."