Santorum just doesn’t have “it.”
He looks like Jerry Seinfeld when Jerry got the haircut that made him look “eight years old.” (The “Edward Scissorhands” episode.)
When he’s in a debate, he has a look of sheer terror on his face, ALL THE TIME. People don’t want a President who is that scared.
Yes I remember seeing that “deer in the headlights” scared pissless look on Santorums face. He also has the odd counterpoint to that look as a whispy smug grin with his nervous laugh.