OPE. CHANGE. Hope and change. Hope 'n' change. Say the words often enough and they begin to take hold, attaching themselves lichen-like to the psyche. Soon they take on a life of their own and assume human form. He is the one Democrats have been waiting for -- the agent, the beacon, the Everyman who can change the culture of Washington and restore hope to the disenfranchised. He even comes from Hope. Arkansas, that is. Or was. How quickly time passes, how urgently things stay the same. Not so long ago, Bill Clinton was the man of the moment, the...