The ruling BJP swept the by-elections winning 12 of the total 15 seats, helping the four-month-old B S Yediyurappa government to retain majority in the Assembly.
Congress Legislature Party leader Siddaramaiah and State Congress chief Dinesh Gundu Rao quit their posts after the party posted a poor show, winning only two seats, as against the 12 it had held of the 15 which went to the bypolls on December 5.
Both tendered their resignations to Congress President Sonia Gandhi, "citing unsatisfactory results."
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