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I think either tense would be fine, because the "once" conveys the order (championed at one time, later changed his mind). The GMAT wouldn't make you chose.
Without the "once," I think you would need to use the past perfect: "Although Smith had championed the charity, he changed..."
About the "although," I disagree that there is no contrast. "Championed" contrasts with "changed," or at least with whatever his attitude became as a result of the change.
_________________ Emily Sledge
Instructor
ManhattanGMAT
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