WASHINGTON _ For the last month, the Democratic presidential candidates have had a straightforward task: Campaign heavily in the small, overwhelmingly white states of Iowa and New Hampshire, and hope to emerge with momentum.
Things are about to get a whole lot more complicated.
A still-jumbled Democratic primary is entering a new phase, as a suddenly truncated political calendar forces the remaining candidates to figure out how to compete in 18 separate contests over the next three weeks _ effectively demanding they transform their local campaigns into national ones.
