The problem with your numbers is that millions of independents who had voted for Obama in 2008 switched to Obama in 2012. Which means that millions of Republicans who voted for McCain in 2008 stayed home in 2008. In spite of the large swing in independent voters, Romney barely topped McCain’s mediocre effort from 2008. The GOP has a serious problem with its base and this purge of conservatives - including the disgraceful sell-out of Allan West - will ensure that the turnout of the base continues to erode.
i meant switched to Romney in 2012. Sorry