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"I've been to 25 states over the past year Reebok ZigTech... and have gotten a lot of great feedback and a lot of encouragement," Santorum said on FOX News Channel's "On The Record with Greta Van Susteren" Wednesday night.

Santorum, 52, served two terms as a Pennsylvania senator before he was defeated in 2006 by Democratic Sen. Bob Casey. Prior to serving in the Senate, Santorum was a member of the House of Representatives from 1991-1995.

He reportedly made a little under $100,000 a year at FOX News Channel as an on-air contributor under a three-year contract set to expire in 2013. However, the network suspended the contract last month, citing a conflict of interest as he publicly mulled a presidential run.
Santorum joins former Massachusetts Gov. Mitt Romney and former Minnesota Gov. Tim Pawlenty as the third viable Republican candidate to form a presidential exploratory committee.
Still, Santorum -- a social conservativeReebok ZigTech who hopes to makes inroads with evangelicals in the leadoff state of Iowa -- is a dark horse candidate for the nomination, trailing better-known potential candidates such as Romney, former Arkansas Gov. Mike Huckabee and former House Speake Newt Gingrich in the polls.

According to the Real Clear Politics average of recent national polls, Santorum currently registers 2.2 percent support nationwide.

Exploratory committees or "testing the waters" committees allow candidates to formally raise money without having to file campaign contribution reports with the Federal Election Commission.

By testing the waters, a candidate can get a sense of his or her ability to raise enough  to conduct polls, travel in various early primary states and set up local organizations and phone banks.

All of these things can be done without registering contributions, provided that candidates do not explicitly refer to themselves as a candidate or raise more than what is "reasonably needed" to test the waters.

In recent years, the formation of an Reebok ZigTechexploratory committee has become the preferred stepping stone toward the announcement of a full-blown candidacy.