The Cancer people are quite manipulative, talks in an exhaustive and elaborate manner; they are capable of favoring their kith and kin but within the ambit of law; they are capable of instigating others; they manage their actions through proxies. Thus the Cancer has the complete characteristics that are needed to become successful politician.
The Cancer talks about their chosen ideology and claims to live on their proposed ideals. But in reality, the Cancer would choose, just the opposite; and live a secretive life too. The Cancer has the ability to swallow the insults and adjust with the abuses; they maintain discreet silence and wait patiently for the opportunistic time.
Thus the flexibility of the Cancer makes them successful in the political field. The Cancer people never mind in ditching their trusted allies to come out successful. The Cancer people take both their success and defeats without any much difference.