By Kanupriya Kapoor and Randy Fabi JAKARTA (Reuters) – After winning Indonesia’s closest ever presidential election, Joko “Jokowi” Widodo now faces what could be his toughest battle yet – winning over his own party. To do that, he must deal with Puan Maharani, the politically ambitious daughter of former president Megawati Sukarnoputri and a powerful figure in the Indonesian Democratic Party-Struggle (PDI-P) that her mother heads and which propelled Jokowi into the presidential palace. For some, there is a risk of a power struggle among the rank-and-file of Indonesia’s most popular party that could muddle Jokowi’s agenda in parliament, where Puan is party leader. “Puan does have followers … of course, they are threatened by somebody like Jokowi.” Puan is heir to a political dynasty that goes back to her grandfather and founding president, Sukarno.