The Justice Department has abandoned its high profile foreign bribery case against businessmen in the military equipment industry after a string of mistrials and acquittals. Prosecutors have spent increasing resources to bring companies to justice under the Foreign Corrupt Practices Act, but their record recently has been very uneven.

Audie Cornish speaks with Jim Tankersley, Economics Correspondent for the National Journal, about how oil prices have affected the outcomes of elections in the past.

The Obama administration outlined a plan on Wednesday to reduce the corporate tax rate to 28 percent. It would also close many loopholes and impose a minimum tax on businesses. The proposal has little chance on Capitol Hill, but it's a starting point for a political debate this election season.

The four remaining Republican candidates debate Wednesday night in Mesa, Ariz. Host Audie Cornish talks with Ted Robbins, who is in Arizona in advance of the state's Republican primary next Tuesday.

While President Obama would have spoken at the groundbreaking for the new National Museum of African American History and Culture no matter when it happened, his appearance Wednesday highlighted a shift in his outreach to African-American voters.

The sport — yes, sport — of monster truck driving has come a long way. What started in the late '70s as intermission entertainment for tractor-pulling competitions is now a multimillion-dollar industry that tours the world. "We are a show," says veteran Rod Schmidt, "but yet we're racers."

At the groundbreaking on the National Mall on Wednesday, President Obama said the newest Smithsonian museum has been "a long time coming" and will serve "not just as a record of tragedy, but as a celebration of life." The National Museum of African American History and Culture is expected to open in 2015.