Democrats award most of their delegates by congressional district in Wisconsin and in other states. Usually that doesn’t matter much because the share of delegates each candidate gets in a state winds up closely matching their statewide share of the vote anyway. Sometimes, however, a candidate gets lucky or unlucky because of rounding.
Right now, Sanders looks to be getting a bit unlucky in Wisconsin. There are six delegates available in each of the 1st, 6th, 7th and 8th congressional districts. He leads Clinton in each one, but is splitting those delegates 3-3 with her in each case because his lead isn’t quite large enough for a 4-2 split. That could change as more votes are reported, of course.
