Retired pediatric neurosurgeon Ben Carson has pulled to within 4 points of GOP presidential front-runner Donald Trump, a new poll shows. In the New York Times/CBS News survey released Tuesday, Trump maintains the lead of the presidential pack, with 27 percent support. But Carson is within striking distance, at 23 percent, which is within the margin of error, making it a statistical dead heat.Carson's rise compared with his polling at 6 percent support in the pre-Aug. 6 debate Times/CBS News survey; Trump was at 24 percent in that earlier poll, showing Carson's gains the most significant in that time frame,...