Is it an advantage or a disadvantage for the government to set the General Elections for the same date as the Local Council Elections?

Poll Duration:                 10th-20th February 2008
Cast Votes:                                       2944
Valid Votes:                                      2489

It's an advantage.:               820 votes   =   33 %
It's a disadvantage.:             867 votes   =   35 %
It's neither nor.:                802 votes   =   32 %

The editor would like to point out, that this poll is not representative for the whole country. However, it gives a clear indication anyway.