While I don't think every member of the Republican Party is racist, there have been some instances of coded language used to rile up the base.
Prime example is the GOP Primary Debate in South Carolina. Gingrich used the term "Food Stamps President" and it caught so much steam.
There's no question IMO the "Food Stamps President" phrase was just him saying "Look at this guy giving all of these poor black folks MORE welfare money via Food Stamps". Let's face it, the majority of people will have a negative reaction when they hear the term foodstamps, and a lot of people will generally think about the black welfare mom with 5 kids on foodstamps buying lobster (I hear that every other day).
Some will say he didn't mean it that way, he was just pointing out that BO has the highest number of people on foodstamps. Gingrich lived in the South, he would know coded language in the south better than most people. That huge ovation he got when he called BO the Food Stamps President was him playing the race card and he knew it. The reaction of that crowd in SC wasn't "YES HE'S THE FOOD STAMPS PRESIDENT!" it was "I'M SICK OF OBAMA GIVING OUT ALL THESE FOOD STAMPS TO THESE LAZY BLACKS WHO DON'T WANT TO WORK".