The battles for Oklahoma and Arkansas are too close to call, but Sen. Ted Cruz (R-TX) and Donald Trump are duking it out for the top spot in Oklahoma. Trump had been leading handily from polls that were conducted in February. Right now, Trump is leading Cruz 32/29 in Oklahoma. Rubio is coming in third at 23 percent (so far.) Arkansas will be updated as soon as returns begin to roll in, and the final results will be included in the final update.
UPDATE: Initial results show Rubio leading in Arkansas 35/28/23 over Trump and Cruz respectively. Polling was scarce, but the latest poll has Cruz up with a slim 4-point lead.