The Obama presidency has not led to a post-racial America, says Toby Harnden, but black Republicans in Congress could help break down barriers . Campaigning a few miles from Fort Sumter, where the first shots of the Civil War were fired in 1861, Tim Scott described last week how he was born into poverty and a broken home, much like Barack Obama. But the conclusions that Scott, 45, drew were very different from those of Obama. When he was 15, a man who ran a Chick-fil-A fast-food restaurant taught him "that there was a way to think my way out...