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GOP presidential candidate Mitt Romney will spend the next seven months convincing us to send him to the White House. To get there, he'll have to make a strong case to one very important voting bloc: women.

A poll out this week by ABC and the Washington Post shows President Obama with a 19-point lead over Romney with women voters. For Romney to win, he's got to make a significant dent in that margin.

How do you measure who is an effective teacher?

More states are wrestling with that question, now that the Obama administration is encouraging schools to evaluate teachers with a combination of student test scores and classroom observations.

The question of whether teacher evaluations are reliable indicators for teacher effectiveness has long been controversial. But New York City reignited the debate when it rated thousands of teachers with test scores alone — and then released those ratings to the public.

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Major storms have reached a swath of the Great Plains from Oklahoma City up through central Kansas and into Nebraska. Weekends on All Things Considered host Guy Raz speaks with Chance Hayes, the Warning Coordination Meteorologist at the National Weather Service office in Wichita, Kansas.

From North Korea's failed missile test to one of the biggest scandals unraveling in China, weekends on All Things Considered host Guy Raz talks with James Fallows of the Atlantic about the latest stories in the news.

NPR's Joel Rose has a round-up of the week's news in the Trayvon Martin shooting case. Neighborhood watch volunteer George Zimmerman is in jail and the legal case is moving forward.

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This is WEEKEND EDITION from NPR News. Scott Simon is away. I'm Linda Wertheimer. After a long, turbulent primary season, Mitt Romney is now fully in general election mode. With Rick Santorum out of the race, Romney is trying to clarify the differences between himself and President Obama. He's also trying to nail down his support from the Republican base. NPR's Ari Shapiro reports from St. Louis on Romney's speech yesterday, to the annual convention of the National Rifle Association.

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This is WEEKEND EDITION from NPR News. I'm Linda Wertheimer.

President Obama is in Colombia today, along with 33 leaders, gathered for the Summit of the Americas. During his visit, the president hopes to highlight growing economic ties within the region. On his way to Colombia, Mr. Obama made a swing-state pit-stop in Tampa, Florida.

NPR's Scott Horsley reports.

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As the Summit of the Americas gets under way today, there is one embarrassing incident which threatens to distract from international efforts to focus on trade and the economy. Twelve U.S. Secret Service agents have already been sent home for alleged misconduct involving prostitutes in Cartagena. The agents have been replaced and the Secret Service says its security plans at the summit has not been compromised.

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Now that President Obama is in Cartagena, he'll begin the conversations about trade and business opportunities in Latin America. But the Summit of the Americas is not the first meeting this week for President Obama and Brazilian President Dilma Rousseff.

On Monday, Rousseff visited the White House. And after this weekend's summit, Secretary of State Hillary Clinton will head to that Brazil's capital, Brasilia.

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Spring cleaning usually means clearing out your closet. But, it's more than that in Philadelphia. Spring-Cleanup is a city-wide effort with residents headed out today to tidy up sidewalks, streets and even utility poles. Many of them are covered with so-called bandit signs, advertising cash for junk cars and the like. From member station WHYY in Philadelphia, Elizabeth Fiedler reports on a competition to tear down as many of these illegal signs as possible.

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This is WEEKEND EDITION from NPR News. I'm Linda Wertheimer.

Greek Orthodox Christians celebrate Easter at midnight tonight. It's traditionally the biggest holiday in Greece. But there is a cloud over the celebration. Reporter Joanna Kakissis sends us this postcard from Athens and the inner-city cathedral of Saint Lucas.

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Time now for sports.

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WERTHEIMER: Its spring and its playoffs, the march to the Stanley Cup is under way in hockey. NBA teams are still jostling for spots in their post-season.

Joining us to sort it all out is NPR sports correspondent Tom Goldman.

Hey, Tom.

TOM GOLDMAN, BYLINE: Hello.

It's been a rough stretch for Pennsylvania's state Legislature. Within the past two months, four onetime floor leaders have been sentenced, pleaded guilty or found guilty of corruption charges. But a jury verdict isn't stopping one of those legislators from running for re-election.

Former state House Speaker Bill DeWeese is campaigning for another term, though earlier this month, he gave a farewell address on the Pennsylvania House floor.

A dozen Secret Service agents tasked with providing security for President Obama at a summit in Colombia have been sent home for alleged misconduct involving prostitution, The Washington Post reports.

Fresh Air Weekend highlights some of the best interviews and reviews from past weeks, and new program elements specially paced for weekends. Our weekend show emphasizes interviews with writers, filmmakers, actors, and musicians, and often includes excerpts from live in-studio concerts. This week:

One doesn't necessarily associate spring travel with heavy reading. For one, books are bulky luggage, the weighty enemies of economical packers; even an e-reader takes up precious space in one's overflowing duffel. And two, escapist migration to mountaintops or flowery fields or seaside locales for sun worship and meditative communion with nature connotes a markedly book-free environment, an escape from the office or the solemn halls of academe.

In 2009, jazz pianist Alfredo Rodriguez showed up in Laredo, Texas, with only a suitcase, some sheet music and one aim: to collaborate with Quincy Jones. A Cuban seeking amnesty in the U.S., Rodriguez ended up arrested by Mexican border officials. He says they questioned him for hours and demanded money.

Third in a four-part report

These days it can take a village to create a child. Technology means someone who never thought they'd be able to conceive can use a sperm donor, an egg donor and a surrogate — a woman who bears a child for someone else. But the law has not kept pace with technology, and with so many people involved, a key question remains: Who is a legal parent?

After a financial bailout earlier this year, fees in Portugal's health system have risen substantially. As a result, nongovernmental organizations say, the poor and elderly in Western Europe's poorest country can no longer afford essential care. Some Portuguese fear that austerity measures are threatening not only their livelihoods, but their lives.

Alfredo Silva, 67, showed up at an anti-austerity protest in Lisbon last month dressed as a skeleton. He says the costume shows the effect of Portugal's $100 billion bailout on retirees like him.

North Korea this week quite literally demonstrated an old truism, with the world as an anxious witness. It turns out that reaching space is, as the saying goes, as tough as rocket science.

The much hyped launch of the Unha-3 rocket, which North Korea said was meant to place a satellite into orbit to celebrate the centenary of the country's "Great Leader" Kim Il Sung, apparently failed Friday shortly after launch. It was the fourth time North Korea had tried and failed to do it, adding to the growing worldwide history of failed rocket launches.

In a new book, Relics: Travels in Nature's Time Machine, Harvard entomologist and photographer Piotr Naskrecki documents his travels, from New Guinea to New Zealand and beyond, looking for organisms whose genes can tell us something about conditions on Earth millions of years ago.