With the first U.S. presidential debate now history, the 2012 election has entered its final phase, and both major party candidates are making their final pitches to the voters. Polls suggest very few Americans are genuinely undecided; most of us are firmly convinced that one side or the other has the stronger argument. But how are those attitudes formed? Why does one person grow up to be a liberal, and another a conservative? Social science research is beginning to come up with some compelling answers.
Infographic: Column Five