twitter is banned in Japan

we all know the power of twitter now allmost twitter is used in all the countries and twitter has really changed our life with its 140 char word, we have already see the how twitter played major role in American president voting and Mr.Barack Obama is won that voting, they used the power of twitter and won that voting, now latest news comes that Japanese government has banned the use of twitter by the country's politicians in the run up to next month's elections, in Japan there is election in next month and that's the reason Japanese government has declared to band on politicians to use of twitter in japans’ next voting,
what did you think about this that twitter is help or hurts in elections?