The man identified himself as a resident of the Bageshwar district, CNN-IBN reported, and police were trying to confirm his identity.
The incident prompted police to tighten security at rallies where Gandhi is to appear as the Feb. 21 election approaches.
Sources told CNN-IBN that no changes had been made to her campaign itinerary.
Sonia faces a challenge from Bollywood star and Member of Parliament Hema Malini.
Biologists detail four new deep-sea 'killer sponges'
Pregnant Mila Kunis wins 'Best Villain' at MTV Movie Awards