OKLAHOMA CITY (AP) — The last time Super Tuesday arrived in Oklahoma, Sen. John McCain had already sewn up the GOP nomination. This time around, it's a month later than in 2008 and the four candidates for the Republican presidential nomination are fighting for votes in Oklahoma without the usual broad network of local chairmen and dedicated volunteers. Rick Santorum has visited the state twice in the past month. Newt Gingrich, Mitt Romney and Ron Paul have visited here, too. With 40 delegates at stake, Oklahoma isn't the biggest prize during the Super Tuesday primaries. But its reputation as the "reddest of the red states" means that whoever wins here could claim to have the conservative credentials necessary to put together an effective challenge to President Barack Obama in the fall.