If elected to the post, 53-year-old Khader will be the first Muslim leader to serve as Speaker of Karnataka assembly.
The government also termed the alleged insult to the farmer as an infringement on "dignity and self-respect", and said it cannot be tolerated.
At least 2,800 government doctors on Monday submitted their resignation letters in protest against the non-fulfillment of their demands. The meeting between the doctors and the state's Health Minister UT Khader, remained inconclusive.
The controversial issue of Muslim girls wearing 'hijab' in educational institutions, which had hit national headlines last year with a government pre-university college in Udupi banning it inside classrooms, does not appear to be a serious campaign issue for the May 10 elections to the Karnataka assembly.
The bill was defeated by a voice vote on February 23 in the upper house, where the Opposition has a majority, after it was passed by the assembly on February 21.
Five candidates were in the fray for the four seats in the elections, including Janata Dal-Secular contestant D Kupendra Reddy.
There were reports of such incidents at temples in various places including Bengaluru, Hubballi, Belagavi, Mysuru, Chikkamagaluru, Yadgir, Mandya and Kolar among other places.
The 79-year old veteran leader, who has already announced his retirement from electoral politics, said there is no question of him sitting at home, and after the assembly session he will tour the state and campaign for the party and its candidates.
The portfolios were cleared by Congress president Rahul Gandhi as the exercise had turned out to be tricky for the party state leaders.
While Shivakumar is as usual contesting from Kanakapura, Siddaramaiah is returning to his home turf of Varuna in Mysuru district, which is currently represented by his son Dr Yathindra Siddaramaiah.