Scott Horsley

President Obama on Wednesday visits students at the University of Iowa, where he'll again make a pitch for low-cost college loans. It's the last stop on a trip that's taken Obama to two other battleground states: Colorado and North Carolina. He's primarily reaching out this week to younger voters.

President Obama sets off on a two-day tour of college campuses Tuesday to tout a plan to keep student loans more affordable.

The trip is billed as official business, but it has a political flavor. Stops include: North Carolina, where Democrats hold their national convention this summer; Colorado, where Obama accepted his party's nomination four years ago; and Iowa, where his White House campaign was launched in 2008.

All three states are expected to be hard-fought battlegrounds in November.

More than 99 million federal taxpayers had filed their returns as of Tuesday, with more than 80 million of those expecting a refund.

People who file at the last minute — and Tuesday is this year's deadline — are somewhat more likely to owe money to the government. And if Congress and the president don't act, next year could see many more Americans paying higher taxes.

That's not because either President Obama or presumptive Republican challenger Mitt Romney advocate a tax increase for most Americans.

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President Obama is back in Washington this morning, after a weekend summit in Colombia. The gathering with leaders from throughout the Americas produced some agreement on trade and some disagreement on drug policy in Cuba.

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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.

Jim Yong Kim, President Obama's nominee to be the leader of the World Bank, is an unconventional choice. As a global health expert, he's a medical doctor who helped start an international health organization. He currently serves as president of Dartmouth College.

"Despite its name, the World Bank is more than just a bank," Obama told reporters during the White House announcement Friday morning. "It's time for a development professional to lead the world's largest development agency."

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The second day of President Obama's all-of-the-above energy tour brought him to Oklahoma.

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STEVE INSKEEP, HOST:

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President Obama visits Oklahoma today, talking of speeding construction for a major oil pipeline. Yesterday, he visited a solar panel farm in Nevada. Those were just two of the stops on a presidential effort to defend his energy policies. He's under pressure from Republicans because of rising gas prices.

And we start our coverage with NPR's Scott Horsley.

Vice President Joe Biden wears a lot of different hats in the Obama administration. He's a longtime Senate insider who can negotiate with Republican Senate leader Mitch McConnell. He's a foreign policy veteran who helped to lead the transition in Iraq.

And one other thing to keep in mind, whenever there's idle political gossip about replacing Biden on the ticket with Hillary Cinton: He serves as a kind of White House ambassador to the middle class.