You can see the moment at which there was no further debate as to what to do:
23:45 DBordello What chain is Mt. Gox on
23:45 gavinandresen Eleuthria: if you can cleanly get us back on the 0.7 chain, ACK from here, too
23:45 MagicalTux DBordello: we stopped import before the fork
23:45 Eleuthria alright
Which is further evidence that it is economic nodes and not miners who control Bitcoin. In this case, there was mt. Gox with like 80% (educated guess) of the economic activity of Bitcoin at the time. So a miner (pool) switches to follow the will of the economic nodes (i.e., whichever side Mt. Gox was on), even when that one pool alone had majority hashrate (both sides combined).
You can see the moment at which there was no further debate as to what to do:
http://bitcoinstats.com/irc/bitcoin-dev/logs/2013/03/11#l1363045508.0
Which is further evidence that it is economic nodes and not miners who control Bitcoin. In this case, there was mt. Gox with like 80% (educated guess) of the economic activity of Bitcoin at the time. So a miner (pool) switches to follow the will of the economic nodes (i.e., whichever side Mt. Gox was on), even when that one pool alone had majority hashrate (both sides combined).