THe last two polls I just read here both showed that, in their respective states, Gingrich leaving would help Santorum.
Maybe other polls show different — if you know of any, post them.
About the only way we will know, is for it to happen. Even if Newt dropping out were to go Santorum’s way, it won't be enough to turn it around for him.
If Santo does well in Illinois, you can bet it will likely force a brokered convention, and the Prank Democrat voters may likely shock the vote again, like they did in Alabama and Mississippi. Which will go to Santorum’s favor.