According to police, a PCR call was received around 11.23 AM about the incident in which 38-year-old Abhay Kumar was roughed up by Amit Bidhuri.
Bidhuri, who is related to AAP MLA Sahi Ram Pehelwan, had gone to the Swaraj India's table near a polling centre where he and Kumar engaged in an altercation, police said.
An annoyed Bhiduri hit Kumar, who was then taken to AIIMS Trauma Centre with a minor injury, they said.