I talked to Sue Lovell this weekend. She's on the DNC and from the Houston area. I asked her about the voting process for DNC chair.
Basically, she likes Dean, but he's one of many on the list, including:
Gov. Vilsack
Wellington Webb
She mentioned a few others, but without as much weight.
Regardless of who is on the list, what was most important was that the Texas Delegation to the DNC votes as a block to give more power to Texas. You have to woo the state rather than individual members.