the final push. republican presidential candidates have one more day to court iowa s first in the nation voters. mitt romney is ahead in the latest tolls. but a late surge by rick santorum and others means this could be anyone s race. reporter: rick santorum, in far northwest iowa. his campaign across this state is finally paying off. santorum could win tuesday night. i said this is an episode of survivor and you re just going to survive. and if you keep surviving, you never know what s going to happen. we kept surviving. reporter: the new poll puts santorum third. but if you count gop voters surveyed on the last two days of the four-day poll, santorum is tying with mitt romney at the top. and the surge could win him the endorsement of conservative leader, steve king. i m closest with rick santorum of those three. reporter: mitt romney kept to his game plan, sounding like the nominee. president obama and i offer stark contrast. reporter: ron paul, with a shot