Addressing a rally here in favour of INLD candidate Ravinder Singh Baliyal, Badal said Congress had committed its biggest political mistake by "sending Chautala to jail".
"This vindictive act has resulted in uniting all Haryanvis as one and now they are committed to teach an unforgettable lesson to the party as well as its leader Bhupinder Singh Hooda. The last fort of the Congress will crumble on October 15," he said.
"Never ever have I seen such enthusiasm among people to oust an incumbent government. I welcome the decision of the people of Haryana to end Sonia Gandhi and Robert Vadra 'raj' and the ushering in of 'janta raj' (peoples rule)," he said.
The SAD president said a vote for INLD-SAD combine would be a vote for development and social welfare.
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He said all the major development projects as well as introduction of social welfare schemes, including old age pension scheme, had been initiated during the chief ministership of Devi Lal and his son Om Prakash Chautala.
Addressing a rally at Tohana in favour of INLD candidate Nishan Singh Kamboj, the SAD president said INLD-SAD alliance would sweep the Haryana polls.