The Democratic Progressive Party (DPP) has been advised by former president Chen Shui-bian (陳水扁) to reverse a recent slide in public opinion polls by becoming assertive and aggressive, which he said would help the party’s prospects of victory in next year’s presidential election.

“The struggle of DPP Chairperson Tsai Ing-wen (蔡英文) in recent polls should serve as a warning about her campaign strategy,” Chen, who is serving a 17-and-a-half-year jail sentence for corruption and money laundering, wrote in an article published yesterday.

In opinion polls conducted by the DPP, Tsai’s lead over her main opponent in January’s presidential election, President Ma Ying-jeou (馬英九), slid from 7.5 percent in late April to 0.2 percent last month