三次选举的数字,自己看看吧, 看看有什么规律

2012
 
OBAMA
69,000,000
873 Counties
18/19 Bellwethers
Win FL, OH, IOWA
Win House Seats
 
 
2016
TRUMP
74,000,000
2497 Counties
18/19 Bellwethers
Win FL, OH, IOWA
Win House Seats
 
2020
BIDEN
81,000,000
477 Counties
1/19 Bellwethers
Lose FL, OH, IOWA
Lose House Seats
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