"Though the Cauvery issue is a serious livelihood issue for Tamil Nadu, the ruling party and government seem to have other serious problems and hence do not want to agitate against Karnataka," PMK leader S Ramadoss said.
"It is important that political parties in Tamil Nadu forget their differences and unite under one umbrella for this issue. The Tamil Nadu government should convene an all-party meeting to discuss it," he said.
Referring to the protests in both states for and against the dam, he said the bandh in Karnataka was a 'huge success' as it had the state government's backing.
It was not so in Tamil Nadu as the state government did not endorse it, he said.
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"This epitomises the differences in the ways Tamil Nadu and Karnataka governments approached the Cauvery issue," he said.
On March 27, the Tamil Nadu Assembly had adopted a unanimous resolution, urging the Centre to rein in Karnataka from going ahead with its plan to build the dam across the inter-state river.
Farmers' bodies, supported by opposition parties, had called for a state-wide bandh in Tamil Nadu on the issue the following day.