The results of the presidential preference ballot is binding in that it determines the proportion of delegates that will be sent to state convention and beyond. This is new and is not understood by many, including precinct chairs. It was not in fact a mere straw poll as in years past.
See
http://www.dfl.org/index.asp?Type=B_BASIC&SEC={1F40B529-D0E3-4AD5-A3E4-98B881ACB94D}
or
http://www.minnesotaforkucinich.com/caucus.phpfrom MN for Kucinich caucus Q & A:
Each attendee may cast a vote for the Democratic presidential candidate they prefer by filling out and signing a presidential preference ballot. The ballots are then tallied, and the proportion of votes received by each candidate determines how many delegates to the national convention that candidate receives from Minnesota. NOTE: THIS IS A DIFFERENT PROCEDURE THAN HAS BEEN USED IN THE PAST. Essentially, this is Minnesota's primary election, and the polling place is the precinct caucus location.
The 72 pledged delegates are divided among the different presidential candidates according to the results of the presidential preference ballot from the precinct caucuses. For example, if Dennis Kucinich got 40% of the votes in Congressional District 5, he should get about 40% of the delegates from that district. Since Congressional District 5 is allotted 8 delegates, Kucinich would get at least 3 of those delegates.
There is one important exception to the allotment of delegates. A candidate must get at least 15% of the vote in the Congressional district in order to get ANY percentage of the delegates from that Congressional district. The candidate must also get 15% of the vote in the whole state in order to get ANY of the delegates selected at the state level. If a candidate receives 14.9% of the vote, he or she gets no delegates. For this reason, it is vital that enough Kucinich supporters attend precinct caucuses to make the 15% threshold.