It actually happened.
Hillary has never lost a single general election matchup poll to any republican heading into the 2016 election. Until now!
http://www.realclearpolitics.com/epo...tial_race.html
And considering most polls historically skew in favor of the democrat, I have to think its even bigger than this. The 1992, 1996, 2000, 2004, and 2008 elections all underestimated republican support. 2012 was an outlier in that it actually underestimated democrat support.
The last time the white house was an open seat, in 2008, you had McCain dominating the polls vs Obama until early 2007. Obama began to take a lead and turn the polls around.
http://www.realclearpolitics.com/epo...225.html#polls
This election, you have Hillary dominating Jeb Bush in the polls until early 2015, where Jeb seem to be turning the polls around. Very interesting.
source:
1992 election:
All polls overestimated Clinton's lead
http://www.ropercenter.uconn.edu/pub...n/82/82045.pdf
1996 election:
pew center poll: Dole 38%, results Dole 40.7%
http://www.people-press.org/1996/11/...le-38-perot-9/
1996 Election:
All polls except Zogby overestimated the Clinton lead
http://www.ropercenter.uconn.edu/pub...n/82/82045.pdf
2000 election: Only 10 of 15 polls underestimated Bush43's share of the popular vote. average poll: Bush43 46.4%, results were Bush43 47.8%
http://www.electoral-vote.com/evp200...olls-2000.html
2004 election: average poll was Bush43 +1.5%, results were Bush +2.4%
http://www.realclearpolitics.com/epo...kerry-939.html
2008 election: average poll was Obama +7.6%, results were Obama +7.3%
http://www.realclearpolitics.com/epo...225.html#polls
2012 election: average poll was Obama +0.7%, results were Obama +3.9%
http://www.realclearpolitics.com/epo...bama-1171.html