Conversation so far:
When was L. K. Advani in the prime minister candidacy?
L.K. Advani was in the prime minister candidacy in 2007
Did L. K. Advani win his candidacy?
No L.K Advani did not win his candidacy. Manmohan Singh served another term in 2009
Did the prime minister candidacy in 2007 end L. K. Advani's career?
L.K. Advani unexpectedly resigned from all his posts in the BJP following the appointment of Narendra Modi as the head of the electoral campaign of BJP for the 2014 elections.
Did anything else happen during the prime minister candidacy in 2007 besides L.K Advani's defeat and resignation from the BJP?
Following the defeat in the elections, L. K. Advani paved the way for Sushma Swaraj to become the Leader of Opposition in the Lok Sabha.

Question: who were some of his opponents?
Self-contained rewrite: who were some of L. K. Advani's opponents?