influence of civil rights activist stokley carmichael. be sure to watch c-span's washington journal beginning live at 7:00 a.m. eastern sunday morning. join the discussion. >> tomorrow, the first in a series of c-span programs featuring people considered possible running mates for the presidential candidates. we'll show an interview with former house speaker newt gingrich who's mentioned as a possible running mate for donald trump. also senators elizabeth warren and sherod brown, both potential additions to the democratic ticket. that's tomorrow at 6:30 and again at 9:30 eastern on -span. >> next, c-span looks at 30 years of senate coverage on c-span2. then a discussion on possible action to address puerto rico's debt. of that democratic presidential candidate senator bernie sanders of vermont at a campaign rally in los angeles. >> today is a historic occasion. the proceedings of the united states senate are being broadcast to the nation on television for the first time, not that we have operated in secret until now. millions of americ