Forget knowing how the Democratic presidential race will end -- lately, our ideas about even when it will end seem shakier and shakier. There's the issue of whether Michigan and Florida will hold revotes, and now Puerto Rico, which was scheduled to hold the last nominating contest of the race on June 7, will be voting on June 1. That puts the territory ahead of Montana and South Dakota, both of which are scheduled to hold primaries on June 3.

According to the Los Angeles Times, Puerto Rico's move is less of a change than a correction -- apparently, local party leaders had always intended to hold the vote on the first Sunday of the month, and someone screwed up the date. There is one substantive change, however; the contest was slated to be a caucus, but it will reportedly now be a primary. This would seem to be of at least a little help to Hillary Clinton, who has performed poorly in caucuses thus far.