The sidelined leader's victory is being seen as a worrying development both for AIADMK and principal opposition Dravida Munnetra Kazhagam, which finished third behind the ruling party.
The country is all set for the second round of elections on April 18 in the ongoing seven-phase Lok Sabha polls that will elect 543 members to the lower house of Parliament. Going to polls in the second phase will be 95 seats in 12 states and one Union Territory. Here is a look at some of the big names contesting in phase two of Lok Sabha elections.
He said his faction will formally file a petition with the Election Commission of India on Friday.
The actor met with Kerala Chief Minister Pinarayi Vijayan and discussed the political situation in neighbouring Tamil Nadu.
Tamil Nadu Chief Minister Edappadi K Palaniswami said that the vow taken by AIADMK General Secretary V K Sasikala has been fulfilled.
It is thanks to these internal differences that the much-awaited merger between the two factions has not made any headway so far, reports R Rajagopalan.
"The result of the RK Nagar bypoll is an outcome of the tacit understanding between DMK working president M K Stalin and Dinakaran," Panneerselvam and Palaniswami said in a joint statement on Sunday night.
The MLAs have been disqualified with effect from Monday, under the 1986 Tamil Nadu Assembly Members Party Defection Law.
A full one year after Jayalalithaa was hospitalised on the night of September 22, 2016, followed by long hospitalisation and death on December 5, Tamil Nadu continues to be rocked by instability and non-governance of every which kind, says N Sathiya Moorthy.
The 2015 RK Nagar bypoll, in which Jayalalithaa was elected by a huge margin of 1.5 lakh votes, had witnessed a record 75% turnout
The meeting has sparked speculation that the actor will join the Aam Aadmi Party.
Clad in black shirts, AIADMK coordinator Pannneerselvam and co-coordinator Palaniswami led a silent march
The Dravida Munnetra Kazhagam on Monday said it would soon move a no-confidence motion against Tamil Nadu Assembly Speaker P Dhanapal as it accused him of "deliberately harping on his community to malign" the party.
There was also no stay of the disqualification of rebel AIADMK MLAs.
The court granted the relief to the two saying they were no longer required for custodial interrogation and have been asked to furnish a personal bond of Rs five lakh each and two sureties of the like amount.
Even as the unity moves between the two AIADMK factions seem to be going nowhere, former chief minister O Panneerselvam is working on a grand alliance of other Opposition parties, reports R Rajagopalan.
National politics will have a bearing on the RK Nagar byelections, and even in the state elections whenever they are called, says R Rajagopal.
More than 750 constituencies spread across four states and one union territory will go to the polls on Tuesday
Utter confusion prevails in the ruling All India Anna Dravida Munnetra Kazhagam in Tamil Nadu.
A new political crisis is brewing in the VK Sasikala camp in Tamil Nadu -- differences between Chief Minister Edappadi Palaniswami and party general secretary Sasikala.
AIADMK had decided to 'de-link' V K Sasikala and Dinakaran from the party.
Here is the glimpse of the political turn of events in the state
He said whoever supported the Palaniswami rule cannot go to the people for votes.
In the video, the former All India Anna Dravida Munnetra Kazhagam supremo is seen holding a glass and drinking from it, while reportedly watching TV.
President Ram Nath Kovind, Vice-President M Venkaiah Naidu, Prime Minister Narendra Modi, Bharatiya Janata Party chief Amit Shah, Congress president Rahul Gandhi and other leaders condoled the death of the seer.
We don't have confidence in the chief minister, the MLAs said.
The interesting bit about the Azamgarh poll finding on India TV was the whopping percentage of Muslims backing the SP-BSP alliance, which sort of negates Mayawati's appeal to the community to not split their vote with the Congress, says Saisuresh Sivaswamy.
Rajinikanth's personal trait can become a political issue if he enters politics and could get translated as sympathy if not support for the BJP, which can cut both ways, says N Sathiya Moorthy.
It should not surprise anyone if either of the contending parties in the 'TN speaker's case' comes up with a submission for referring the matter of 'speaker's powers' to a Constitution Bench. In political terms it could buy more time for the Edappadi camp, to settle down and stabilise itself, says N Sathiya Moorthy.
The Rs 89 crore question before Tamil Nadu now is what shape a central intervention would take, and if there would be any role whatsoever for acting governor, Ch Vidyasagar Rao, in it, says N Sathiya Moorthy.
Given the twin embarrassments of a TTV win and party nominee Karu Nagarajan losing his deposit, polling fewer votes than NOTA, Prime Minister Narendra Modi and BJP boss Amit Shah would be pushed to rethink their strategy. Tamil Nadu would thus become a part of the BJP's grander strategy for 2019 rather than a stand-alone affair, says N Sathiya Moorthy.
To claim that Tamil Nadu was waiting for a messiah of the 'spiritual' Rajini kind is misplaced, if not mischievous, says N Sathiya Moorthy.
But not for too long, as TTV Dinakaran can still play spoilsport, says N Sathiya Moorthy.
With faction bosses not seeming to control anyone any more, can the BJP count on the AIADMK for the presidential polls any more, asks N Sathiya Moorthy.