The Federal Bureau of Investigation again is investigating Clinton's use of a private email server while she was secretary of state.

This has some, including Trump, questioning her morals.

A vote for Hillary is a vote to surrender our government to public corruption that threatens the survival of our Constitution.

At a Clinton for President rally, Clinton spoke to the crowd questioning the morality of Trump's behavior.

Donald Trump is out there stoking fear, disgracing our democracy and insulting one group of Americans after another.

Hillary is the one who broke the law.

Presidential campaigns are normally about issues like the economy, the military and foreign policy, but not this one, says expert Mad Alec.

This race has primarily become about character and about personality, and I think this issue of character is going to remain front and center.

I don't think it's going away, and I think to an unusual degree, issues and in policies.

Air not really.

A central is, as they typically are.

Voters question if they can trust Hillary Clinton.

Others fear that Trump is not reasonable enough to be president.

The concerns voters have about both candidates have made this election different from other presidential elections, says political scientist Patrick Hickey.

This is a very odd American presidential election in that both candidates, um, are viewed unfavorably by the majority of the American people.

You know, usually that might happen to one candidate, but not both.

The candidates have made each other's character a big part of their message to voters.

In the second presidential debate, Trump talked about Clinton's character.

We have a increase in murder within our cities, the biggest in 45 years.

We have a divided nation because people like her.

And believe me, she has tremendous hate in her heart.

She got tremendous hatred.

In the third debate, Clinton spoke of Trump's past comments about women.

Donald thinks belittling women makes him bigger.

He goes after their dignity, their self worse, And I don't think there is a woman anywhere who doesn't know what that feels like.

The winner of this election will be the one who can persuade the most supporters to go out and vote, says Patrick Hickey.

This is definitely a kind of anti election as opposed to a pro election, which I think means on Election Day.

Turnout is really going to be what matters Which side can turn out voters toe actually get to the polls?

One of the longest and most divided US election campaigns in recent history will come to an end on Tuesday night.

For many Americans, it can't come soon enough.