The politician, Kamruzzama Fauji, died late on Friday in hospital after suffering burns to 75 per cent of his body, the family said.
The election show on national TV channel Doordarshan was being recorded in a park on Monday in Sultanpur, a town about 160 kilometres (100 miles) from Uttar Pradesh's capital Lucknow.
A man, identified by the police as Durgesh Kumar Singh, emerged from a crowd of about 150 onlookers, doused himself in petrol and then grabbed the local leader of Mayawati's BSP, engulfing the pair in flames.
Mr Singh, who suffered 95 per cent burns, died shortly after the incident, police said.
Police have not come up with any motive for the attack on the politician who was a father of nine children.
But Khalikurzama, the elder brother of Mr Fauji, called the attack "politically motivated" and demanded "a proper probe".
India's numerous television channels are holding nightly debate shows during the nation's staggered nine-phase parliamentary election. The debates are often staged in villages and towns with politicians taking questions in front of local voters.
The election, the world's biggest, will end May 16; many opinion polls have given Narendra Modi-led Bharatiya Janata Party (BJP) an edge over Congress.
The show Monday which featured five local politicians was just ending when the attack took place.
Two other local politicians on the show suffered minor burn injuries while trying to douse the flames engulfing the two other men.
"This man suddenly came on the stage, poured petrol on himself and set himself on fire before tightly hugging one of the political guests," photographer Pankaj Kumar Gupta told AFP after the incident.
Story First Published: May 03, 2014 20:49 IST
RESULT
immolated and hugged BSP leader dies A man who set himself ablaze and embraced a BSP politician during the recording of an election debate in
Man Set Himself On%0D%0AFire Dies-Man who self immolated ...
Man Set Himself On%0D%0AFire Dies A man who set himself ablaze and hugged BSP leader dies during the recording of an election debate
Shocker: Man sets himself on fire during live TV debate ...
Shocker: Man sets himself on fire during live TV debate, embraces BSP leader
Youth sets himself ablaze during live TV show, hugs BSP leader
LUCKNOW: A youth set himself on fire and embraced a BSP leader in Uttar Pradesh's Sultanpur town during a live TV debate on the Lok Sabha election, police
TV debate sees burning man embrace politician News ...
Related News about "TV debate sees burning man embrace BSP leader dies: A man who set himself ablaze and Man sets himself ablaze during live TV
Youth sets himself ablaze, hugs BSP leader
Youth sets himself ablaze, hugs BSP leader Pradeshs Sultanpur town during a live TV debate on the man drenched in petrol stepped out and set
Man who self immolated and hugged leader, dies - Emirates 24/7
Man who self immolated and hugged leader, dies A spectator who set himself ablaze and embraced a local politician nightly debate shows during the
Man ablaze who hugged politician on TV dies - Emirates 24/7
Man ablaze who hugged politician on TV dies grabbed the local leader of the Bahujan Samaj Party, the man set himself on fire is being
Youth sets himself ablaze, hugs BSP leader
Youth sets himself ablaze, hugs BSP leader town during a live TV debate on man drenched in petrol stepped out and set
Man ablaze hugs leader at poll show - Worldnews.com
Horror Indian TV debate sees burning man embrace politician. Youth sets himself ablaze during live TV show, Aflame youth who embraced BSP leader dies.
