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Dont you think they could have reached a plateau in the polls?
Not necessarily - there's still time. I think 2008 is likely to be the best year for the Tories for two decades in terms of opinion polls. That said, Labour managed only 43.2% of the vote even in their 1997 landslide - which isn't much higher. Similarly the Tories were on 42-44% in the four elections between 1979 and 1992.
As I say, I thought 40% was supposed to be the milestone these days. It seems the goalposts have been shifted to 45% just because the 40% mark has been achieved.
No party has managed over 50% in a general election since 1935 - a lot of it is down to an inevitable (but limited) rise in support for smaller parties.