Campaigning in Afghanistan\'s presidential election is ending on Wednesday. Afghans will begin casting their votes on Saturday morning at some 25,000 polling stations, in the country\'s first democratic ballot. Security concerns have overshadowed the run-up to the poll, with the incumbent and clear favourite, Hamid Karzai, holding his first rally on Tuesday. Militants from the Taleban and al-Qaeda have said they will target the vote. Afghanistan\'s election campaign is drawing to a close, just hours after it sprang into life. For nearly four weeks the candidates\' posters, pasted to walls across the country, were the only sign that a democratic ballot was imminent. But on Tuesday, amidst high security, President Karzai finally held a public rally, giving thousands of Afghans a chance to show their support for the clear favourite. Although the other leading contenders, including the former education minister, Yunis Qanuni, and the Uzbek regional leader, Abdul Rashid Dostum, have been more active, this is an election that is likely to be won behind closed doors. Many of the candidates have met factional and tribal leaders in an attempt to secure the support of blocs of voters. When the polls open on Saturday morning, insecurity will be the major concern. Afghan and international forces will be on high alert but many fear that Afghanistan\'s first ever democratic poll will be marred by violence from militants. (BBC)