Prime Minister Vladimir Putin of Russia says voters have held his party accountable for recent shortcomings.
Exit polls suggest the United Russia party gained less than half the vote in the general election on Sunday, after winning almost two-thirds the last time four years ago.
Opposition parties say there was widespread vote-rigging in this election.
But Mr Putin, 59, says most Russians still back his party.
He is to seek the presidency again in March, after already serving two terms from 2000-2008.