Cine stars, cricketers, sportsmen etc are popular and people know them. Hence they need no introduction . Many people also consider them as icons and have some kind of hero worship on them. So when they stand for elections, they need not do much to introduce themselves. The campaign is more easy.
Unlike the political leaders who do not come to their constituency after elected, the cine stars and other celebrities are always seen everyday in TV screens, various sites in smartphone internet, newspapers and magazine, inaugurations of showrooms , malls, or other events etc. People have seen them in many charity events and sponsorship. So people feel they are close to them too.
The only thing they(celebrities and stars) need is to enforce the already present idol about them in people's minds and make the people believe what they promise or offer about future and make people have faith and vote for them.
People also feel that as the celebrities are earning huge amount of money otherwise, they may not be corrupt .
It is now a fact that a state like Kerala - where film stars were not able to succeed in politics or elections- have started electing film stars to Parliament or legislative assembly. So the title questions gets a positive answer .