In Atlanta on Friday morning, Vice President Biden confirmed for the first time that he’s seriously considering making a bid for the presidency in 2016. His entry would instantly scramble the race. …
Over the past four months, Clinton has consistently polled lower in surveys in which Biden is included as a choice. A simple statistical analysis controlling for time trends (not shown here) estimates that Clinton performs about six percentage points worse in these polls. By contrast, Sanders’s numbers are affected not at all: they’re essentially the same whether or not Biden appears on the ballot of candidates offered to survey respondents. CONT.
Patrick J. Egan (NYU), The Monkey Cage
Recent polls: Democratic presidential preference