Both candidates are using the final hours of campaigning to make their messages clear and key battlegrounds, which we'll be keeping a close eye on tomorrow.

Our Lisa Desjardin is at the PBS News Superscreen for a look at the various paths to victory for both candidates.

Lisa, good to see you.

Good to see you.

All right, let's talk about Pennsylvania.

We've heard about Pennsylvania, Pennsylvania, Pennsylvania. Why is it so critical for both candidates on their path to 270?

The Keystone State, living up to its name. Let's look at how the Cook political report rates these races. As you know, seven key swing states. And if you look at what both campaigns see as a potential likelihood in the way states

are leaning right now, then you have North Carolina, Georgia, going for Trump, Arizona, going

for Trump. And let's even say Nevada, which right now is about even goes for Trump. In this

situation, if Kamala Harris is able to win Wisconsin and Michigan, the so-called blue wall,

her only way of getting to the presidency is through Pennsylvania. Now, even if she was able to

win here in Nevada, if she loses Pennsylvania, Trump still wins. Same thing. Even Arizona, if she's

able to win there, she still needs to win in

Pennsylvania. So for the Democrats, the Keystone state is absolutely critical. So if Pennsylvania

is a must win for Harris, what are the must wins for Trump? Right. Let's look at the alternate

scenario here. So let's say that Trump is able to win in Arizona and in Nevada. Now, here we go.

Let's leave Pennsylvania off the board for just a second and leave it blank. Now, if he can't win

in North Carolina and Georgia, his path gets much more difficult. I'll show you what I mean. 16 points

here in North Carolina. Let's say it goes to Kamala Harris. That puts her at 267, just

three points away from winning at all. So in other words, if Trump wants to win, he's got to win

in Pennsylvania and in Georgia, and that's a strange combination. If he's able to do well enough

in Pennsylvania and still lose North Carolina, that's a scenario Republicans don't really see happening

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