Advani addressed meetings at Ranebennur and Davangere, Rajnath Singh in Chikkodi and M Venkaiah Naidu at Sindhanoor and Gangavathi in north Karnataka, from where the party draws much of its strength.
Swaraj addressed party workers in Bangalore.
With central leaders descending on the scene, Chief Minister Jagadish Shettar, party General Secretary H N Ananthkumar, state unit President Prahllad Joshi and former Chief Minister D V Sadananda Gowda also addressed rallies in different parts.
The upcoming polls are proving to be a tough challenge to BJP which saw three Chief Ministers in a span of five years in the first ever party government in the south.
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Adding to its woes, the BJP government is facing anti- incumbency factor, graft charges and other issues.
At his rallies, Advani warned indiscipline would not be tolerated and there was no question of compromise on corruption. '...Within the party zero tolerance for indiscipline, within the government zero tolerance for corruption...," he said.
In her public meeting at Bangalore, Swaraj launched a tirade against the Congress-led UPA government for failing to curb corruption and terrorism in the country.