Pakistan's former prime minister Nawaz Sharif, whose party is considered a front-runner to win general elections in February, will kick off his campaign next week, aides said, days after the Supreme Court cleared him to run for a fourth term. The campaign for the Feb 8 poll, delayed since November, looks set to fire up a lacklustre race in an uncertain political environment after Sharif's main rival and former premier Imran Khan, was jailed and disqualified from contesting. "We will, God willing, start our mass campaign on Jan. 15," Pervaiz Rashid, a close Sharif aide told Reuters, adding that the former premier would speak at a rally two days later.