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One of the defining elements of the 2012 presidential campaign is money. Two dozen wealthy Americans have put in at least $1 million each. And one of the biggest donors is Sheldon Adelson, the casino magnate who has almost single-handedly kept Newt Gingrich's campaign afloat.

Shavings of metal can flake off of the artificial joints and cause serious pain and medical problems in the hip. About a half-million Americans have this type of implant, and though most patients won't have a problem, one doctor called the failure rate "unacceptably high."

Voters in Wisconsin's GOP primary Tuesday are poised to help former Massachusetts Gov. Mitt Romney wrap up his quest for the Republican presidential nomination. But Romney's battle with former Pennsylvania Sen. Rick Santorum has been overshadowed by the campaign to recall GOP Gov. Scott Walker.

Strategists say the president's support for same-sex marriage is helping both sides in states where the issue will appear on November ballots.

Poverty among single mothers is an astounding 66 percent in Reading, Pa., where Jennifer Stepp is raising three children by herself. To survive, she relies on a safety net of support.

Jill Tarter works at the SETI Institute, where scientists seek evidence of extraterrestrial life in the universe by looking for some signatures of its technology. "The amount of searching that we've done in 50 years is equivalent to scooping one 8-ounce glass out of the Earth's ocean," she says.

Robert Siegel speaks with our regular political commentators, E.J. Dionne of The Washington Post and Brookings Institution, and David Brooks of The New York Times. They discuss Mitt Romney and the health care mandate.

When a private firm failed to meet its promise of providing enough guards for the Olympics, the British military was called in to "mind the gap" in security. A reported 3,500 British troops, some of them just back from Afghanistan, will step in to help guard Olympic venues.

When Journey went looking for a new lead singer, they turned to the most obvious place: YouTube. What they found, a new documentary explains, was a bar singer from Manila who became the frontman of a quintessentially American band.

Over the course of his 14-year career as a pitcher, Bob Ojeda threw more than 1,000 strikeouts and countless pitches across the plate. During that entire time, the lefty's pitching arm hurt. "The act itself is sort of violent and completely unnatural," he says. "I think most pitchers certainly feel a level of pain."