As to your definition of "success"....not surprising that education and income are your bellwethers. Others may see success as something entirely different. The Online Dictionary says:
ut oh, I hope this post doesn’t cause chart envy.
2008 CNN Exit Polls have Mormons voting 78% McCain, 19% Obama, which includes all Mormons, not just weekly attending. Your chart has Mormons mixed in with Orthodox and other Christians, and Evangelicals broken out between weekly attending and not which averages out less than Mormons for McCain. Voting for McCain is hardly a test of conservative credentials.
Mormon's success is also high marriage rates, low divorce, many children, more education, less crime, more charity, less dual income latch key kids, and many other metrics. It's clear Mormons are very conservative politically and they shouldn't be attacked leftist style on a conservative political website.
The Book of Mormon narrative is unbelievable to many people including myself, but so is the narrative to other religions. It takes a gift of faith to believe in any of them.