Essentially saying that he should have known better than to go to work for Current TV, Keith Olbermann said Tuesday night that he "screwed up" by taking the job last year.

But while Olbermann said "it's my fault that it didn't succeed," he also figuratively pointed his finger at Current for why things went wrong before he was dismissed last week.

Nine national medical groups are launching a campaign called Choosing Wisely to get U.S. doctors to back off on 45 diagnostic tests, procedures and treatments that often may do patients no good.

Many involve imaging tests such as CT scans, MRIs and X-rays. Stop doing them, the groups say, for most cases of back pain, or on patients who come into the emergency room with a headache or after a fainting spell, or just because somebody's about to undergo surgery.

Former Arapahoe County (Colo.) sheriff Patrick Sullivan, who back in December was charged with trying to trade methamphetamine for sex with a man, "pleaded guilty on Tuesday to charges of meth possession and soliciting prostitution," Denver's KUSA-TV reports.

After going 0-for-3 in Tuesday's presidential primaries, a defiant Rick Santorum dismissed calls to drop out and predicted he'll win the next contest in his home state of Pennsylvania on April 24.

He'll have to — and not because it would put the former Pennsylvania senator on a path to defeat front-runner Mitt Romney, who has been racking up delegates and is increasingly seen as the inevitable nominee.

A loss in Pennsylvania, where recent polls show Santorum is weakening, would "destroy the rationale for him continuing," says Pennsylvania pollster G. Terry Madonna.

Transcript

RENEE MONTAGNE, HOST:

Good morning. I'm Renee Montagne with an early Easter for the dogs of Edmond, Oklahoma. The city's parks and recreation department hosted an Easter egg hunt for dogs. The Daily Oklahoman reports that over 70 dogs took part in the first ever Hound Hunt, sniffing out more than 700 treat-filled plastic eggs, including two silver eggs as grand prizes. One canine contestant went all out, donning a pair of plush rabbit ears for the occasion. It's MORNING EDITION. Transcript provided by NPR, Copyright National Public Radio.

Transcript

STEVE INSKEEP, HOST:

Looking not just to win the NCAA Division I women's basketball championship, but also to be the first team to win 40 games in one season and to do it without a single loss on the way, the Baylor Lady Bears achieved all that last night with an 80-61 win over Notre Dame.

His wins Tuesday in Washington, D.C., Maryland and — most importantly — in Wisconsin has produced a subtle shift in the way Republican presidential contender Mitt Romney is being referred to by the news media.