Yeddyurappa was welcomed by BJP Karnataka unit President Prahlad Joshi and other senior state leaders as he stepped into the party state headquarters along with his supporters. He was given the party primary membership at a function in which no national leader was present.
"Let us forget the past....Let us remove the mutual suspicion and work together as the children of a mother", said Yeddyurappa, who had announced the decision of his party Karnataka Janata Paksha (KJP) to merge with BJP a week ago.
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He said "because of our certain wrong decisions" the Congress which had been pushed to the corner had returned to power in Karnataka and added, "we had committed an unpardonable crime (by enabling it)."
Yeddyurappa said the Congress was facing "bankruptcy" of leadership and the country was craving for Gujarat Chief Minister Narendra Modi to become the Prime Minister.
He said the party should aim at winning more than 20 (of the 28 Lok Sabha) seats in Karnataka in the general election. BJP had secured 18 Lok Sabha seats in the last election.
He said the party should go to the Lok Sabha polls telling the people, "pardon our mistakes. We will not repeat them."
"We have come together with an open mind," said Joshi, after welcoming Yeddyurappa in the presence of former Chief Ministers D V Sadananda Gowda and Jagadish Shettar and national General Secretary Ananth Kumar.
Ananth Kumar, who was perceived as a bete noire of Yeddyurappa and considered a stumbling block for his re-entry earlier said, "we will never separate. We will be together. We will fight together.