New Hampshire primary exit poll.
South Carolina primary exit poll.
Super Tuesday exit polls.
Second Super Tuesday exit polls.
Poll conducted in Georgia.
December ABC News/Washington Post nationwide poll of likely voters.
December Bloomberg nationwide poll of likely voters.
December Rasmussen nationwide poll of likely voters.
Data on likely Democrat voters comes from ABC and the Washington Post; Rasmussen; and Bloomberg.
A few other polls, not featured in this infographic, were taken in December of Americans in general (not only “likely voters”). Those were conducted by NBC and the Wall Street Journal; CBS News; and YouGov.