In the most fiercely contested by-election since the 13th general elections last May, Perak's southernmost parliamentary constituency Teluk Intan will see DAP's Dyana Sofya Mohd Daud face off with BN's Mah Siew Keong.<br /><br />DAP is banking on outstation and young voters to shore up their vote bank, while BN chief Najib Razak promised to make Mah a minister to sweeten the deal for BN voters.<br /><br />Polling has been smooth thus far.