Throughout 2016, polling was often tight in these states and districts, and their voting histories made their outcomes difficult to predict.
For these reasons, we referred to them as "battlegrounds." The reason these states and two districts had so much sway in the 2016 presidential election was largely because most of the electoral college map was already set in place before any votes for president were cast, but the battleground states were still up for grabs.
Those 21 electoral votes that separated Clinton and Trump might not sound all that significant, but they were.
The tightest battleground race between the two frontrunners was in Iowa, where Clinton led Trump by a weighted 4 percentage points.These regulations, known as ballot access laws, determine whether a candidate or party will appear on an election ballot. A presidential candidate must prepare to meet ballot access requirements well in advance of primaries, caucuses, and the general election.For more information, see Ballot access for presidential candidates.Donald Trump won the presidency of the United States.The following candidates ran for the office of President of the United States.Clinton, for example, began the general election with an almost guaranteed 200 electoral votes from 16 states and Washington, D. That's 74 percent of the 270 electoral votes needed to win.