and joe biden has been a great vice president. so this is all politics, this is all moving around. we'll see what happens, but it's a little early. >> it's a little early. but as you well know, it's never too early to be thinking about it behind the scenes, even if you don't want to talk about it in public. when we come back, a virtual tour of the 2013 march on washington and the only surviving keynote speaker at the 1963 march, congressman john lewis, next. you know who you are. you can part a crowd, without saying a word... if you have yet to master the quiet sneeze... you stash tissues like a squirrel stashes nuts... well muddlers, muddle no more. try zyrtec®. it gives you powerful allergy relief. and zyrtec® is different than claritin® because zyrtec® starts working at hour one on the first day you take it. claritin® doesn't start working until hour three. zyrtec®. love the air.