Behind Singapore ruling party's victory, a rising star

Singapore's Finance and Deputy Prime Minister Tharman Shanmugaratnam speaks to Reuters during an interview at his office in Singapore June 5, 2014. REUTERS/Edgar Su

SINGAPORE (Reuters) - Singapore's ruling party is celebrating a resounding re-election victory, thanks partly to its economic Tsar, an ethnic Tamil politician whose voter appeal poses an awkward question for its leaders: can a non-Chinese ever become prime minister?

As the People's Action Party (PAP) settles down to another five years in power, the guessing game of who will succeed Prime Minister Lee Hsien Loon has begun - and the name of Tharman Shanmugaratnam keeps coming up.