These are not actual votes counted, they are the party voting turnout. Very different. You can be a registered Republican and vote for anyone, and that even means a write-in. You do not have to vote party, so there are likely many Republicans who are 'holding their nose' as it's been styled, and voting for Hillary. They well are likely voting for their representatives along party lines. Numbers in the below quote are old, it is up to 37+ million now. Hispanic votes will likely make more of a difference this time than African American votes which were cast in a huge turnout for Obama.
^These findings represent absentee ballots and early votes cast by more than 18.6 million Americans across 37 states where data are available. CNN has partnered with Catalist, a data company that works with progressive candidates and groups, to receive detailed early vote return information this year. Catalist's voter list connects returned ballots with demographic and registration information, such as party registration, gender and age, and allows a closer look at who has already cast a vote.
These are not results -- ballots aren't tallied until Election Day. But the findings provide clues on who is voting, and which party is turning out to vote. And while the numbers track voters' party affiliations, not all Democrats are voting for Clinton, and not all Republicans are supporting Donald Trump.^
edition.cnn.com/2016/10/29/politics/early-voter-data/
More up to date info:
www.wsj.com/articles/early-voting-data-shows-whos-turning-out-1478281004
Fingers crossed...the whole world is watching!