supreme court ruling on citizens united. it leads us directly to a situation where billionaires own and control the candidates they support. >> thank you, senator sanders. this is an incredibly troubling story and seems at this point the irs might be broken beyond repair. for everyone at home equally troubled by this, stay with us. we have some original reporting on this issue. a deep dive into the firsthand human effects of this kind of slackening of campaign finance regulations in a key battleground state. first, immediately up ahead, something lighter. senator cory booker on a new mission to help ease partisan tensions. is it a little self indulgent? the nation's crisis of selfie just ahead. (birds chirping softly in background.) (loud engine sounds!) what! how's it going? heard you need a ride to school.