Clinton needed slightly fewer of these battleground states' electoral votes than Trump.
The tightest battleground race between the two frontrunners was in Iowa, where Clinton led Trump by a weighted 4 percentage points.
We found that Clinton had almost twice as many paths to victory as Trump, at 10,581 different combinations to 5,572, respectively.
The 2016 battleground states are highlighted on the map below in grey.
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.