BJP leaders, including Chief Minister Jagadish Shettar and Joshi, spoke of the need to be united to bring the party back to power while daring the Opposition Congress to name the leader under whom they would fight the polls.
A second time MP from Dharwad, 50-year-old Joshi is from the RSS stable.
Edging out former Chief Minister D V Sadananda Gowda, Mangalore MP Nalin Kumar Kateel and Minister Govind M Karjol, Joshi won the race in what was perceived as strengthening of his hold over the party by BJP National General Secretary H N Ananth Kumar in the post Yeddyurappa phase.
He said a section of party workers feel justice had not been done to them just to placate "someone or his autocratic nature", an apparent dig at former party strongman and Chief Minister B S Yeddyurappa, but added it would be undone.
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BJP would fight the elections under a "sober team and leadership", he said, asking the partymen to face the electoral battle unitedly.
The Congress lacked leadership, he said and challenged it to name who would lead it in the elections. People would also teach a lesson to those who walked out of BJP for "petty reasons", he said, apparently referring to Yeddyurappa.