Democratic officials are in new territory with a competitive election for party chief.
In past races, a leading candidate usually emerged well before actual voting.
This time, there's a high likelihood that will take multiple rounds of voting for former Obama Labor Secretary Tom Perez or a Minnesota congressman, Keith Ellison, or a dark horse candidate to win a majority.
So, party staff and 442 eligible DNC members have had to dust off complicated rules that usually don't matter.
For example, party officials expect about 70 or 75 members to be absent. Nearly all have designated another member to cast paper proxy ballots on their behalf.
That will add a layer of suspense. Members in the room vote electronically, with quick tallies. But the paper proxies must be counted by hand.
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