Their campaign started gaining momentum a few days before obama's arrival.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/bhopal-gas-victims-protest-seek-obamas-help
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/central-chronicle-bhopal
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/madhya-pradesh
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bhopal-gas-disaster
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/union-carbide
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/gas-leakages