So, Mr. Alito seems to be the most conservative.
No, Scalia is. Roberts isn't as conservative as Scalia.
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NYT - The End of The Supreme Court Term
http://www.nytimes.com/2006/07/02/washington/20060702_SCOTUS_GRAPHIC.html?adxnnl=1&adxnnlx=1151800391-/mrxfCIPoXTYoRoR7x+mQA