Elections began on 1/3, so election season began then. For convenience, we can use the 13th of each month:
1/13 16.8 G 14.4 S (Newt First)
2/13 18.0 G 30.3 S (Newt third)
3/13 14.2 G 29.2 S (Newt third)
12/13 Newt was first
11/13 Newt was third
10/13 Newt was fourth
9/13 Newt was fifth
8/13 Newt was sixth
While he was ahead of Santorum, if you go back to before the elections, he was in no position to brag about his position either. He benefited as much from the attrition of alternatives as Santorum.