DETROIT — Four years after Michigan saw a decided and sustained shift toward absentee voting by mail or drop box, election administrators and candidate campaigns are bracing for the effect of early in-person voting as a new way elections could be largely decided ahead of Election Day. Voters wishing to cast a ballot in the Feb. 27 presidential primary can begin visiting early voting stations on Saturday. Early, in-person voting runs for nine days through Sunday, Feb. 25, and allows a voter to obtain a ballot, fill it out on-site and feed it into a vote-counting tabulator just like if it were E…