NEW: Former Vice President Joe Biden's presidential announcement earned him an 11-point polling bounce in a new CNN poll, leaving him head and shoulders above the rest of the Democratic candidates. https://t.co/omvB7OpMr4 https://t.co/GcyYzZLGyJ

NEW: Former Vice President Joe Biden's presidential announcement earned him an 11-point polling bounce in a new CNN poll, leaving him head and shoulders above the rest of the Democratic candidates. https://t.co/omvB7OpMr4 https://t.co/GcyYzZLGyJ (via Twitter http://twitter.com/CNN/status/1123169529515917312)