Rick Santorum, Newt Gingrich and Jon Huntsman are all trying to cut into Mitt Romney's lead in New Hampshire -- but Romney is not the only one they are chasing.

Ron Paul is in second place in many polls leading into Tuesday's primary.

A survey by WMUR-TV/University of New Hampshire put Romney at 44%, followed by Paul at 20%.

Santorum and Gingrich tied for third at 8%, followed by Huntsman at 7%.

So don't be surprised if Paul -- who finished third in the Iowa caucuses, behind Romney and Santorum -- takes some heat during tonight's debate at Saint Anselm College in Manchester.

For a preview of tonight's face-off, check out our OnPolitics post by Catalina Camia.

Writes Catalina: