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President Obama and Republican challenger Mitt Romney are hitting the campaign trail hard this week. On Tuesday, the president was campaigning in Iowa — the state that helped to launch his White House bid in 2008. He told supporters in Iowa he wants a second term in order to finish what he started.

The City Council in San Bernardino, Calif., voted Tuesday night to seek Chapter 9 bankruptcy protection, making it the third California city in less than two weeks to make the rare move. The city faces a $45 million budget shortfall.

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RENEE MONTAGNE, HOST:

Across America people are sweltering through extreme heat this year, continuing a long-term trend of rising temperatures. Inevitably, many are wondering if the scorching heat is due to global warming. Scientists are expected to dig into the data and grapple with that in the months to come. They've already taken a stab at a possible connection with last year's extreme weather events, like the blistering drought in Texas. NPR's Richard Harris reports.

Manchester United is the most famous soccer team in the United Kingdom, and one of the world's most popular sports teams. Now its owners are hoping the team's popularity will translate into big bucks. They're planning to sell Manchester United stock on the New York Stock Exchange. Roger Blitz, of the Financial Times, talks to Renee Montagne about the team's IPO.

A U.S. operation in the mountains near Afghanistan last November killed 24 Pakistani soldiers. Pakistan wanted an apology. The U.S. refused. In response, Pakistan shut down supply routes to Afghanistan for NATO convoys.

After intense talks, two border crossings were reopened last week to convoys for the U.S. and NATO forces.

Pakistan's ambassador in Washington, Sherry Rehman, was at the center of the negotiations. Afterward she called it a moment of great opportunity for the two countries.