"This is not a quick decision. When I made this opinion [seeking release of Rajiv Gandhi killers] in 2011, she did not accept it. However, today, I appreciate her for taking the same stance," M Karunanidhi told reporters when asked if the decision could be considered a quick response.
Karunanidhi also hoped that the Centre would concur with the state government's decision, saying if that happened "we could be more happy."
MDMK chief Vaiko said Jayalalithaa had done a very laudable thing, adding it was a merciful humanitarian move.
"I greet, congratulate and thank her," he said.
CPI(M) leader D Raja said Tamil Nadu Government acted quickly and the decision was very much laudable.
BJP state unit president Pon Radhakrishnan said, "Any move made in accordance with the due process of law" was welcome.
Pro-Tamil leader P Nedumaran expressed gratitude "on behalf of the world Tamils".
PMK chief S Ramadoss welcomed the government decision and urged it to set free sandalwood smuggler Veerappan's elder brother Madiah, whose death sentence was also commuted by the Supreme Court along with that of 14 others last month on the grounds of delay in disposing their mercy pleas.
He said Madiah should be released considering his advanced age and illness as he has spent over 20 years in prison.