Oklahoma is holding its Republican presidential primary on Tuesday, March 6. Supporters of the candidates have probably been hard at work campaigning, including placing campaign signs in public rights-of-way. These are the dates that I've first seen a candidate's signs somewhere while driving in Norman:
Ron Paul: sometime in 2011
Rick Santorum: February 10th or so
Mitt Romney: March 2
Newt Gingrich: N.A.
Santorum is up in the polls here and is expected to win.