A number of states are being "punished" by the democrats and republicans. According to the BBC at
http://news.bbc.co.uk/2/hi/americas/7049207.stm
"The Democratic Party is punishing Michigan and Florida by refusing to accept their delegates at the national convention. So neither state's Democratic primary will count. (The main Democratic candidates have said they will not campaign in either state.)
The Republican Party is penalising Florida, Michigan, New Hampshire, South Carolina, and Wyoming, by reducing their quota of delegates by half."