Twenty-second Amendment to the United States Constitution
The amendment prohibits any individual who has been elected president twice from being elected again. Under the amendment, an individual who fills an unexpired presidential term lasting greater than two years is also prohibited from winning election as president more than once. Scholars debate whether the amendment prohibits affected individuals from succeeding to the presidency under any circumstances or whether it only applies to presidential elections.
Sheryl Underwood
Underwood is a lifelong Republican. However she campaigned for Barack Obama's re-election in United States presidential election, 2012. Underwood also campaigned for Hillary Clinton in the 2016 election "because we have to protect the legacy of President Obama. Low voter turnout benefits Donald Trump and the Republicans. He can't win."