Why do you think the most heavily 'crat precincts are counted LAST?
Democrats have always had this little ploy where they hold back reporting results in selected precincts until they figure out how many votes they need to win. Then, "their" poll workers go to work. They were exposed in Palm Beach FL in 2000, but I remember Bush's FL lead evaporating as the Dems manufactured votes. I've always believed certain Dem precincts cheat big-time where there are almost no Republican representation amongst the poll workers.