The thesis is that, when you discount early voting (which favors Clinton b/c they knew her when they voted but hadn’t heard Sanders’ message yet), Bernie is running even with or slightly ahead.
“That’s right — in each state, most of the early primary voting occurs before the candidates have aired any commercials or held any campaign events. For Bernie Sanders, this means that early voting happens, pretty much everywhere, before anyone knows who he is. Certainly, early voting occurs in each state before voters have developed a sufficient level of familiarity and comfort with Sanders to vote for him.”
Here’s a link to Huffpost...