Afghanistan will vote on Saturday to choose a successor to President Hamid Karzai and to decide the make-up of 34 provincial councils in elections seen as a benchmark of progress since the Taliban were ousted from power in 2001.
Abdul Jabar Haqbeen, governor of Sari Pul province, told AFP that Hussain Nazari and six supporters were kidnapped on Sunday evening.
"They were on their way from Sancharak district to the provincial capital of Sari Pul when they faced a Taliban ambush," he said.
Afghan security forces said they had launched an operation to find the group.
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A roadside bomb in Kunduz also killed five bodyguards protecting a local militia commander today.
The latest violence comes after several high-profile attacks in Kabul in the run-up to polling day.
On Saturday, the Kabul headquarters of the Independent Election Commission (IEC) was attacked when five Taliban militants occupied a nearby building and unleashed rockets and gunfire at the fortified compound.
All five attackers were killed by Afghan security forces six hours after the attack began, and there were no other casualties.