When politicians have the power on when an election can be held

Source : http://thestar.com.my/news/story.asp?file=/2013/2/24/nation/20130224125049&sec=nation

"Datuk Seri Najib Razak said he had yet to call for the general election because he wants to prove to the rakyat that the policies introduced by his government over the past four years has impacted positively on them."

Set a date and time for the elections rather than having it anytime you want because you have not shown that you are capable of running the country for the past 4 years. 
That's like a 100m dash runner saying he isn't ready to run for the Olympic Games final because he was sick that day and expects everyone else to wait for him to get well and ready.