Are the polling margins in key battleground states like Ohio and Pennsylvania really that tight between Clinton and Trump? Larry Sabato, author of The Kennedy Half Century, joins NBC's Kristen Welker to explain why he's not convinced by the numbers.June 21, 2016
UP NEXT
After testimony, Sen. Harris says AG Barr lacks all credibility and must resign
00:38
WATCH: Sen. Harris, showing off prosecutorial prowess, puts AG Barr on his heels
08:10
Sen. Hirono lays into AG Barr
07:43
AG Barr: 'No, I did not exonerate' President Trump
01:20
AG Barr will not recuse himself from investigations stemming from Mueller report
01:53
Klobuchar: White House tried to stop legislation to secure elections from foreign interference