Florida to set presidential primary for January 31 MIAMI (Reuters) - Florida is expected to set its U.S. presidential primary election for January 31, setting off a game of leapfrog as various states try to increase their influence by moving ahead in the nominating process, state officials said on Wednesday. feeds.reuters.com/~r/Reuters/PoliticsNews/~3/jVGpW1MoLcI/us-usa-campaign-florida-idUSTRE78R3UY20110928