| Name of the Candidate | Party Name | Results |
| RAJ KISHORE SINGH | Janata Dal (United) | Won 79286 |
| BRISHIN PATEL | Hindustani Awam Morcha (Secular) | 48225 |
| VINAY PASWAN | Independent | 7975 |
| RAJNARAYAN KUMAR | Lok Dal | 4695 |
| MAHTAB AHMAD KHAN | Jan Adhikar Party (Loktantrik) | 4301 |
| MUHAMAD ABAS | Independent | 2765 |
| AMIYA BHUSHAN | Independent | 2009 |
| MAHABIR PRASAD | Independent | 1959 |
| KUNDAN SINGH | Aap Aur Hum Party | 1735 |
| SIGESHWAR BHAGAT | SOCIALIST UNITY CENTRE OF INDIA (COMMUNIST) | 1663 |
| SUDHIR KU SHARMA | Gareeb Aadmi Party | 1556 |
| RAJ KUMAR SINGH | Bajjikanchal Vikas Party | 1435 |
| CHANDRASHEKHAR PRASAD SINGH | Bharti Samudaya Party | 1370 |
| MANOHAR RAY | National Janta Party (Indian) | 1200 |
| GHANSHYAM KUMAR SINGH | Independent | 1150 |
| PAPPU KUMAR SAHU | Garib Janta Dal (Secular) | 899 |
| None of the Above | None of the Above | 4275 |
| AC No | Category | Poll Phases | Last Date of Nominations | Date of Polls | Result |
| 125 | GEN | Phase III | Oct 01st 2015 | Oct 28th 2015 | Nov 8th 2015 |
Vaishali legislative assembly segment is part of Vaishali Lok Sabha constituency. It is home to a total of 2,76,423 eligible voters of whom there are 1,48,921 male voters and 1,27,491 female voters. Vaishali assembly constituency consists of Goraul, Paterhi and Vaishali community development blocks.
One of the eight assembly segments located in the Vaishali district of Bihar, Mahua is currently held by Brishin Patel of the Janata Dal (United) who won the seat in 2010 general assembly polls to the Bihar Legislative assembly by defeating his nearest rival Veena Shahi of the Rashtriya Janata Dal (RJD) by a margin of 12828 votes in a bipolar contest. In that election, while Brishin Patel, a former Bihar minister, polled 60950 votes, Veena Shahi received 48122 votes.
Sanjay Kumar Mishra, who entered the fray as a candidate of the Congress, was relegated to the eighth place with just 2472 votes. A prominent politician of Bihar, Brishin Patel had thrown his weight behind Jitan Ram Majhi in the recent political drama of Bihar in which Nitish Kumar once again became the Chief Minister. Brishin Patel had won both the elections to the Vasihsali seat in 2005 as a nominee of the JD (U). On both the occasions his nearest rival was Veena Shahi, who entered the fray as a Congress candidate. As a Congress nominee Veena Shahi had won the seat in 2000 by trouncing Brishin Patel, then an RJD member.
Veena Shahi, a former Bihar Minister, is the daughter-in-law of former Bihar Minister L P Shahi. L P Shahi’s daughter Ujjawala Shahi was relegated to the eighth place in the assembly election to Hajipur in 2010. L P Shahi had claimed the Vaishali seat in 1967, 169 and 1972.
Earlier Brishin Patel had been elected from the Vaishali assembly seat in 1980, 1985 and 1990. He was elected to the Lok Sabha from Siwan parliamentary constituency in 1991 on the ticket of the Janata Dal. In the byepoll to Vaishali assembly seat in 1991 necessitated due to his resignation, the seat went in favour of Hemant Shahi of the Congress. Hemant Shahi was the husband of Veena Shahi who joined the BJP in 2014.
Vaishali is one of the six assembly constituencies that combine to form the Lok Sabha constituency of Vaishali which is currently represented by Rama Kishore Singh of the Lok Janashakti Party (LJP) who won the seat by defeating his nearest rival and sitting RJD MP Raghuvansh Prasad Singh by a margin of 99267 votes in the 2014 parliamentary elections which resulted in the installation of Narendra Modi government at the centre. Earlier Raghuvansh Prasad, former Union Minister in the Manmohan Singh government, had won the Vaishali Lok Sabha seat five times in a row (1996, 1998, 1999, 2004 and 2009).
Other five assembly constituencies that fall under the Vaishali Lok Sabha constituency are Minapur, Kanti, Baruraj, Paroo and Sahebganj.
Raj Kishor Singh (Raisa) from JD(U) is into tough fight against Brishin Patel fielded by HAM-Secular led by former Bihar CM Jitan Ram Manjhi.
While Raj Kishore can count on the tradional voter base of JD(U) and RJD combine, Patel is assured of support from the dalits and mahadalits in the caste hierarchy.