Elections are invariably more messy, more contingent, than they may seem in advance, and the coming year's Democratic presidential primaries are unlikely to prove an exception. Former Gov. Howard Dean (D-Vt.), who has fervor, volunteers and money to burnand now, with former Vice President Al Gore's endorsement, has begun to pick up major establishment supportcould effectively end this thing as early as Feb. 3. Or not. On that date, his opposition could be winnowed down to a sole anti-Deanretired Gen. Wesley Clark seems the likeliest prospectwho'd then duke it out with Dean in subsequent primaries. Or not. The power of the voters is often the power to confoundin the primary process, state by bloody state. Herewith, then, a cheat sheet on who's strong where, what to expect and what defies augury. Washington, D.C., Jan. 13 (0 Delegates) Sens. Joe Lieberman (D-Conn.), John Edwards (D-N.C.) and John Kerry (D-Mass.), Rep. Dick Gephardt (D-Mo.) and Clark have pulled out of the inside-...