>> george mclellan's failure in robert e. lee's emergence as a field commander marked a decisive moment in the eastern theater that in turn profoundly shaped the larger direction of the conflict. >> gary gallagher on the week- long june 1862 battles that drove the union army away from the confederate capital. tonight at 10:00 p.m. eastern. sunday, more from "the contenders" -- we look at key political figures who ran for president and lost, but changed history. >> i remind you that extremism in defense of liberty -- >> barry goldwater, the 1964 republican candidate who lost to lyndon b. johnson and 730 eastern and pacific. this weekend on c-span3. >> at the foot of that bridge, i was speaking. -- beaten. i thought i was going to die. >> 1965, john lewis took part in a voting rights march in montgomery alabama 0 that took him across a bridge. >> we came within hearing distance of the state troopers. a man identified himself and said, i am a major of alabama state troopers. this is an unlawful march and it will not be allowed t

>> george mclellan's failure in robert e. lee's emergence as a field commander marked a decisive moment in the eastern theater that in turn profoundly shaped the larger direction of the conflict. >> gary gallagher on the week- long june 1862 battles that drove the union army away from the confederate capital. tonight at 10:00 p.m. eastern. sunday, more from "the contenders" -- we look at key political figures who ran for president and lost but changed history. >> i remind you that extremism in defense of liberty -- >> barry goldwater, the 1964 republican candidate who lost to lyndon b. johnson and 730 eastern and pacific. this weekend on c-span3. >> at the foot of that bridge, i was speaking. -- beaten. i thought i was going to die. >> 1965 john lewis took part in a voting rights march in montgomery alabama 0 that took him across a bridge. >> we came within hearing distance of the state troopers. a man identified himself and said, i am a major of alabama state troopers. this is an unlawful march and it will not be allowed to