Jagdeep Rana, a disgruntled AAP volunteer, had fought the 2013 Assembly elections in the national capital.
After the assault incident, he was rushed to the city government-run Aruna Asaf Ali Hospital from the Assembly premises.
"He was brought here at around 3:30 pm. He is currently in trauma centre to undergo medical tests to find if any internal injury has occurred," an official at the hospital said.
Rana and Rajan Kumar hurled pamphlets inside the Delhi Assembly while a session of the House was underway, leading to a scuffle.
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The protest drew the ire of the AAP lawmakers, and as the two men were being taken away by security personnel, some of the AAP MLAs jumped on to them and allegedly thrashed them while they were outside the House.
The police personnel present in the Legislative Assembly premises then sought to bring the scuffle to an end, which lasted for nearly 30 minutes.
Delhi Assembly Speaker Ram Niwas Goel later ordered one- month jail for the two protesters.
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