When does early voting start, and how many votes are cast that way? Our guide explains

http://www.dailykos.com/stories/2016/10/12/1576277/-When-does-early-voting-start-and-how-many-votes-are-cast-that-way-Our-guide-explains
"As of Oct. 12, 18 states have already started early or in-person absentee voting."