Kumar said he had canvassed for JD(U) in Gujarat in 2007 but would not be able to make it for the campaigning for the December polls.
"I am busy with Adhikar rally in Patna on Nov 4 and I have to go to Pakistan on a goodwill visit for a week in the first week of November," he told reporters after a state cabinet meeting here.
Besides, he said he has to prepare an annual report card on the performance of his government in the past one year for submission before the people of the state in November-end as he has been doing every year since coming to power in 2005.
The winter session of the state assembly is also scheduled to begin from Nov 29, he said, explaining the reasons for not going to Gujarat for campaigning. JD(U), a long-time partner of BJP in NDA, is fighting separately in around 30 seats in Gujarat.
The party had won one seat last time in the bastion of Narendra Modi whom he has criticised on many occasions for communal riots in that state in 2002.