Joe Biden has visited Iowa countless times over 32 years, in previous presidential bids and as vice president. But Tuesday was the first time he arrived in the state as the Democratic front-runner. https://t.co/hq7H0tlMOG https://t.co/EJSX5T63z9

Joe Biden has visited Iowa countless times over 32 years, in previous presidential bids and as vice president. But Tuesday was the first time he arrived in the state as the Democratic front-runner. https://t.co/hq7H0tlMOG https://t.co/EJSX5T63z9 (via Twitter http://twitter.com/CNN/status/1123546143659573248)