Chuck's article is titled "Why I Chose Newt Over Santorum" even though Newt is barely mentioned. The article is a laundry list of grievances against Santorum, chief of which is "How can the alternative to Romney (Santorum endorsed and defended Romney in 2008) also be a Romney supporter?"
Good points. Santorum has many problematic past votes and positions. Really, the more one examines the evidence, the more one is compelled to support Newt, whose conservative infidelities are chiefly symbolic or rhetorical. When it counted, Newt almost always voted the conservative way.