What is "McCainism"?

NPR has an excellent coverage of John McCain's maverick profile within the GOP and what it might mean for the Republican Party as a whole and for a possible McCain presidency. What will the Republican base make of his foreign policy commitments to the war in Irak with his wish to reform the American immigration policy and his stance on campaign funding ( on the latter issues he parts way with the Republican orthodoxy)? If they are disappointed with these proposals they are likely to stay at home.
Maybe his new message will attract new voters to the GOP : that is probabaly what he is aiming at.