From New Scientist:
"BARACK OBAMA or John McCain? Floating voters in the upcoming US election may already have made up their minds - they just don't know it yet.
"Bertram Gawronski, a social psychologist at the University of Western Ontario in London, Canada, and his colleagues asked 129 residents of Vicenza, Italy, whether they would support a controversial proposal to enlarge the city's US military base. To measure subconscious biases, the team used an "implicit association" test to record, for example, whether volunteers associated pictures of the base with positive words such as "joy" or negative ones such as "pain".
"When polled a week later, many who were undecided about the base in the first poll had resolved to support or oppose it - and the team found that their decision could be predicted by their responses on the association test (Science, vol 321, p 1100)."
Hmm, people's decisions are affected by what things they think of as good or bad -- what a surprise! But that doesn't mean they've already "made up their minds" on all future decisions. You've only made up your mind when you know you've made up your mind, because that's what "making up your mind" means.