With less than a week to go before Iowa caucuses, former Pennsylvania senator's strategy of traveling widely in the state appears to be paying dividends, as he shows up in polls as a top-tier candidate.VIDEO: Santorum on Recent Surge Perry Calls Santorum Earmark AddictEx-Bachmann Campaign Official Hit for DefectionCampaign Carl's Gingrich 1-on-1Does Iowa Pick Winners?New Funding Rules Fuel GOP Ad War