Just a few months ago, most observers believed Republicans had a pretty decent chance to take control of the U.S. Senate. Now, that doesn't seem as likely.

Separate appearances Friday by President Obama and Rep. Paul Ryan before an AARP meeting in New Orleans proved that the third rail of American politics, Medicare and Social Security collectively, is still very much electrified.

Speaking to a supremely friendly audience via live video feed from Virginia, where he was campaigning, Obama drew repeated applause and cheers with promises to defend Medicare and Social Security from Republican proposals that he said threaten the entitlement programs' ability to deliver the kind of benefits seniors have become accustomed to.

One hundred ten chimpanzees will retire from biomedical research, the National Institutes of Health announced today. The move comes as some groups are pushing for a ban on all medical chimp research.

The NIH has been reviewing its chimp research since December. That's when a report from the Institute of Medicine said that there was almost no scientific need for doing biomedical research on chimps.

Both President Barack Obama and Republican vice presidential hopeful Paul Ryan presented their visions for Medicare to the nation's most influential lobbying group for the elderly on Friday. Julie Rovner has parsed their remarks and joins Audie Cornish to provide some context.

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In New Orleans today, thousands of senior citizens were treated to two different visions for their future. President Obama and GOP vice presidential candidate Paul Ryan each addressed the AARP.

As NPR's Ina Jaffe reports, they took questions on topics ranging from Medicare to Social Security, and back to Medicare.

Under California's criminal justice realignment program, counties are taking over responsibility from the state for low-level felons. And that has affected how inmates with histories of mental illness move through the system even after they're released.

Republican dreams of taking control of the U.S. Senate in November have been declared all but dead over the past several days by prognosticators pointing to trouble facing the party in unexpected places.

Missouri and Indiana come to mind.

But don't count Senate race analyst Jennifer Duffy among them.

"I'm not ready to call this done and over," Duffy said of the GOP's push to pick up four seats, which would definitely tip the Senate balance of power. "We seem to be in some period of transition. Whether it's permanent or not, we'll know in a couple weeks."

Despite complaints from NFL coaches and players, the league and its locked-out officials are no closer to reaching a deal than they were last week, according to reports. The two sides are separated by "significant and serious economic gaps," an anonymous source tells the AP.

A representative of the NFL Referees Association confirmed that talks had taken place, but he would not go into detail, the AP reports.

Bob Woodward's The Price of Politics, about the battles between Obama and Congress, debuts at No. 1.