SuperPAC NextGen Climate Action aired a 60-second ad about Iowa Republican Senate candidate Joni Ernst featuring two rich guys with a briefcase full of cash. YouTube hide caption

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Syrian rebel fighters in the northern city of Aleppo in August. The Obama administration has been vetting rebel groups and decided that more than a dozen are moderate enough to arm. Zein al-Rifai/AFP/Getty Images hide caption

itoggle caption Zein al-Rifai/AFP/Getty Images

Nuala O'Connor, president and CEO of the Center for Democracy and Technology, testifies on net neutrality issues before the Senate Judiciary Committee on Wednesday. Win McNamee/Getty Images hide caption

itoggle caption Win McNamee/Getty Images

Iranian Foreign Minister Mohammad Javad Zarif speaks during a recent news conference in Rome. Zarif told NPR that the U.S. has been hesitant and contradictory in its approach to dealing with the self-declared Islamic State. Fabio Campana/EPA/Landov hide caption

itoggle caption Fabio Campana/EPA/Landov

This human-scale lab rat cage is parked near a skate park in Denver, Colo., to make a point about the lack of science on marijuana. Richard Feldman Studio/Sukle Advertising and Design hide caption

itoggle caption Richard Feldman Studio/Sukle Advertising and Design

House Speaker John Boehner has expressed cautious support for the White House plan. He and other House GOP leaders are backing a measure to authorize the arming and training of moderate Syrian rebels. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

In Del Norte, Colo., Public Works Supervisor Kevin Larimore shows off solar panels that provide electricity for the town's water supply. Despite generating its own solar energy, the town is still at risk of a blackout if its main power line goes down. Dan Boyce/Inside Energy hide caption

itoggle caption Dan Boyce/Inside Energy