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Mexicans go to the polls July 1 to choose their next president, and polls show that voters seem inclined to embrace the past. The center-left Institutional Revolutionary Party, or PRI, which ruled the country for more than seven decades before being ousted 12 years ago, holds a solid lead.

But Mexico's young are making their voices heard: Some fear a return of authoritarian rule; others simply want jobs.

Making Noise

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LINDA WERTHEIMER, HOST:

Good morning. I'm Linda Wertheimer. Faster than a speeding bullet, more powerful than a locomotive and not born in Ohio. The idea of Superman was conceived in Glenville, Ohio back in the 1930s, but when a proposed Superman-themed license plate called Ohio birthplace of Superman, DC Comics and Warner Communications objected. Superman, they point out, was born on the planet Krypton. It's MORNING EDITION. Transcript provided by NPR, Copyright National Public Radio.

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Now, for a global perspective on our national weight problem. The number of humans on the planet is now more than seven billion. And our total weight is 287 million tons. That number comes from a new study that suggests weight, and not just headcount, should be considered when looking at the impact of people on the planet.

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To find out more, we called Ian Roberts. He's a professor at the London School of Hygiene & Tropical Medicine, and is the lead author of this study.

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Mitt Romney has wrapped up his most extensive campaign trip since becoming the all-but-official Republican nominee for president. Over the past five days, he visited six potential battleground states, touring each by bus. Along the way, he honed his attacks on President Obama, while also trying to show voters a more relaxed Mitt Romney than they've seen so far.

The tour, called Every Town Counts, stayed mostly in counties friendly to Republicans, ending with three stops in Michigan yesterday, the state where Romney was born.

Leaders of the world's biggest economies wrapped up the G-20 summit in Mexico Tuesday with a promise to work together to promote jobs. The meeting comes amid worrisome signs of slowing growth in the United States and elsewhere.

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The founder of WikiLeaks, Julian Assange, spent the night at the embassy of Ecuador in London. Yesterday, he unexpectedly walked into the embassy and requested political asylum. Assange is seeking to avoid being extradited from Britain to Sweden, where he's wanted for questioning about allegations of sex crimes, including rape. We're joined by NPR's Phil Reeves in London. Phil, why do this now?

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For the Miami Heat, it's three down, one to go. Last night in Miami, the Heat pulled within one win of an NBA championship, with 104 to 98 victory over the Oklahoma City Thunder. That gives Miami a 3-to-1 lead in the series and a comforting statistic for Heat fans to think about until tomorrow night's game 5. No team in NBA history has come back from a 3-1 deficit in the finals. NPR sports correspondent Tom Goldman joins us now to talk about it.

Good morning.

TOM GOLDMAN, BYLINE: Hi.

Federal Reserve policymakers release their latest statement on the economy Wednesday, and Chairman Ben Bernanke will attempt to explain the Fed's actions in a post-meeting news conference. There are several things the Fed could do to try to boost growth, but whether they'd be effective is debatable.

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Now, to policy making with some fizz. The mayor of Cambridge, Massachusetts, has proposed limiting the size of sodas and sweetened drinks that can be sold in the city.

Henrietta Davis said she was inspired by the mayor of New York. Michael Bloomberg has proposed a ban on sales of oversized sugary drinks in his city's restaurants. Mayor Davis says soda is a factor behind increasing obesity and heart disease among young people.