The DNC is telling their party loyalists, either you do what the DNC says, or you will be punished.
The NY Times story-
The sanctions will be directed at candidates who campaign in any state that refuses to follow a 2008 calendar of primaries and caucuses that was also approved Saturday. Any candidate who campaigns in a state that does not abide by the new calendar will be stripped at the party convention of delegates won in that state.
The party adopted a broad definition of campaigning, barring candidates from giving speeches, attending party events, mailing literature or running television advertisements.
According to Howard Dean's DNC-, a candidate had better not advertise, give a speech, attend a party or run any television ad is any state that they have not previously approved by the DNC.
According to the Boston Globe, DNC officials are stating that a candidate better not set foot in any state they have not previously approved.
DNC officials said the party may penalize any candidate who sets foot in a state that flouts the new scheduling rules.