The San Luis Reservoir in central California is the largest "off-channel" reservoir in the U.S. It is currently at less than 30 percent of its normal capacity. Kirk Siegler/NPR hide caption

itoggle caption Kirk Siegler/NPR

On the campaign trail, Amanda Renteria talks often about her parents, who were migrant farmworkers in the Central Valley. Courtesy Amanda Renteria for Congress hide caption

itoggle caption Courtesy Amanda Renteria for Congress

Surrendered handguns are piled in a bin during a gun buyback event in Los Angeles on May 31, 2014. David McNew/Getty Images hide caption

itoggle caption David McNew/Getty Images

Sonia Marquez of the Colorado Immigrant Rights Coalition is encouraging Latinos to turn out for this year's midterm elections. Kirk Siegler/NPR hide caption

itoggle caption Kirk Siegler/NPR

Sen. John Walsh, D-Mont., has been accused of plagiarizing a portion of his 2007 master's thesis. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

This statue is located in Utah's Capitol building, beneath a mural of Brigham Young and the first Mormon pioneers traveling out west. "Utah is a place that understands the value of immigration," says Utah's speaker of the House, Becky Lockhart. Kirk Siegler/NPR hide caption

itoggle caption Kirk Siegler/NPR

In Oracle, Ariz., on Tuesday, protesters gather near the entrance to a juvenile facility in an effort to stop the arrival of a busload of Central American immigrant children. The bus never arrived. Matt York/AP hide caption

itoggle caption Matt York/AP

Picketers supporting independent truck drivers at the ports of Los Angeles and Long Beach stand outside a container terminal. Kirk Siegler/NPR hide caption

itoggle caption Kirk Siegler/NPR