Mitt Romney has more than half the delegates needed to clinch the GOP presidential nomination after wins in three more presidential primaries Tuesday. In other headlines, the Dallas-Fort Worth metro area was struck by as many as a dozen tornadoes yesterday; President Obama will sign the STOCK Act today, which bars members of Congress from profiting from information gained from their jobs; 200 U.S. Marines arrive in Australia for a permanent joint-training mission; and Baylor topped off a perfect 40-0 season with a win against Notre Dame in the Women's NCAA Basketball Championship last night.

Mitt Romney continued on the path to securing the Republican presidential nomination last night, winning all 37 delegates in Maryland, all 16 delegates in the District of Columbia, and at least 30 delegates in Wisconsin. In a speech after the results were tallied, Rick Santorum vowed to keep fighting. Wisconsin Public Radio's capitol reporter Shawn Johnson and The Takeaway Washington correspondent Todd Zwillich join us to look at the big picture from last night's results as well as a look at President Obama's own campaigning.

If you need proof that the economy is looking up, you need only look as far as your neighborhood car lot, or maybe even your own driveway. This week it was announced that there was a major bump in March auto sales. How major? Chrysler alone experienced a 34% increase in sales over the course of the month. Paul Eisenstein is the publisher of TheDetroitBureau.com. He explains what to make of these auto numbers, and whether they’re sustainable.

In the ongoing reporting of the Syrian uprising, there has been little information about the violence committed against women. Using a creative web based tool, our guest hopes to fix that. Lauren Wolfe is the director of Women Under Siege, a Women's Media Center project that has co-created a site to crowd-source data of violence against women. The first of its kind, this live, web-based map gives the world access to information on the violent uprising that has been, until now, impossible to report due to Syria's strictly monitored borders.

This month, two prisoners in the U.S. will mark the 40th anniversary of their solitary confinement in the notorious Angola Prison in Louisiana. It's believed to be the longest period of time in such confinement in U.S. penal history. Tim Franks of our partner the BBC reports on their case, and meets another former inmate who'd been kept in solitary confinement for 29 years at Angola.

Rafid Ahmed Alwan al-Janabi is one of the most important people in the 20st Century, but most people only know him by his CIA codename: "Curveball." Mr. Janabi was a CIA informant whose information helped lead the nation to invade Iraq and begin one of the costliest wars in US history. Curveball makes his first public appearance in a two-part BBC documentary entitled "Modern Spies." The documentary presents a complicated character aware of the implications of his actions but unwavering in his reasoning. Michael Rudin, who produced the series, explains what it was like to speak to the man who helped bring two nations to war.

Residents in North Texas are cleaning up this morning after tornadoes tore through the Dallas metro area. We speak with Lieutenant Tim Jones from the Sheriff's Office in Johnson County about the damage and cleanup. In other headlines, Romney sweeps primaries in Wisconsin, Maryland and Washington, DC; five former New Orleans police officers will be sentenced today for their roles in the deadly shootings of unarmed residents after Hurricane Katrina; and a popular spicy tuna roll could be the cause of a massive salmonella outbreak across 19 states.

Among Florida cities, Sanford has a remarkable amount of green space. As WMFE reporter Matthew Peddie noted for WNYC’s Transportation Nation blog, Sanford has spent more than $20 million in the last two decades creating more than 30 parks and green spaces. However, Sanford is also notable for being home to numerous gated communities — like The Retreat at Twin Lakes, the neighborhood where 17-year-old Trayvon Martin was shot and killed as he walked back from 7-Eleven.

The commonalities and tensions between the black and Latino communities in the United States — and in particular, in the American south — have been a source of much discussion in the Trayvon Martin case. On yesterday's program, Pulitzer Prize-winning journalist Isabel Wilkerson mentioned some dramatic statistics on how blacks and Latinos in the American south perceive one another. Duke researchers found that an overwhelming majority of Latinos in Durham, North Carolina, 78 percent, felt they had the most in common with whites. What’s more, nearly 60 percent of Latinos surveyed reported they believed that few or almost no blacks were hard-working or could be trusted.

Yesterday President Obama criticized his likely general election opponent Mitt Romney by linking Romney to the latest Republican budget plan. As the likelihood of Romney's GOP nomination increases, the attack lines are beginning to be unveiled. For a look ahead at what we can expect in the general election, we're joined by Todd Zwillich, The Takeaway's Washington correspondent.

Yesterday on the show, ProPublica reporter Kim Barker said that going through Ron Paul's expenses was "like poetry." "I really just saw it like a way to track what it's like to campaign," Barker said. The thousands of lines of expenses in the Federal Election Commission filing from the Ron Paul campaign include everything: iTunes music, FedEx mailings, Salvation Army supplies, travel tolls, party rentals, and meals at places called Smash Burger and Thai Flavors. Today we're talking about election year poetry: seeing truth and beauty from the tiny details of a campaign's mundane expenses.

Popular science is more popular than ever. Its subjects also seem more rarefied than ever: string theory, theoretical physics, theoretical astrophysics. Whatever happened to the more tangible natural sciences? The ones we all think we know — chemistry, for example. We all remember studying the periodic table of the elements in high school, maybe even in college, but do we remember what it all meant? Do we understand what the elements do — and what they can do?

A new report by Germany's central bank says women at the top of the banking industry spur their male colleagues to take bigger risks. Based on an analysis of German bank executive teams from 1994 to 2010, the Bundesbank study undermines the widely held view of the "calming influence" female staff have on a male-driven industry. The report – which also says the presence of women in senior roles was a contributing factor to the banking crash – has provoked a furious response. Mary Ellen Iskenderian is the President and CEO of Women's World Banking.