Full Idea
Intuitionists in mathematics deny excluded middle, because it is symptomatic of faith in the transcendent existence of mathematical objects and/or the truth of mathematical statements.
Gist of Idea
Intuitionists deny excluded middle, because it is committed to transcendent truth or objects
Source
Stewart Shapiro (Thinking About Mathematics [2000], 1.2)
Book Reference
Shapiro,Stewart: 'Thinking About Mathematics' [OUP 2000], p.9
A Reaction
There are other problems with excluded middle, such as vagueness, but on the whole I, as a card-carrying 'realist', am committed to the law of excluded middle.