He later joined the Bahujan Samaj Party and made his first run for the Rajasthan Legislative Assembly, contesting the Pachpadra constituency in the Barmer district; however, Prajapat lost this election.
[2] He then joined the Indian National Congress, and ran again in Pachpadra in the 2008 Rajasthan Legislative Assembly election.
[5] Prajapat ran again for the seat in the 2018 Rajasthan Legislative Assembly election, defeating Choudhary with 69,393 votes to 66,998.
In 2021, Prajapat sided with Rajendra Singh Rathore and Gajendra Singh Shekhawat, both high-ranking members of the BJP, in calling for an official investigation into the police killing of an alleged smuggler in Barmer district.
[9] Throughout his career, Prajapat campaigned strongly for the creation of a new district centered around the city of Balotra.