The 2024 presidential election may come down to how a handful of critical swing states vote, and a winner may not be declared in two of those states for several days due to mail-in ballot rules. In order to capture a majority of Electoral College votes, former President Donald Trump and Vice President Kamala Harris — the presumptive Democratic nominee expected to become the official standard-bearer at next month’s Democratic National Convention — will be competing heavily in a small handful of battleground states. In both 2016 and 2020, Pennsylvania and Wisconsin played decisive roles in deter…