And the war of words between Hillary Clinton and Donald Trump is heating up.
Over in the red corner, Trump branded Clinton "corrupt", while warning she would "destroy American healthcare forever".
He even told potential Clinton voters with "buyer's remorse" they could still change their vote in four states, at a campaign stop last night. "For all those voters with buyer's remorse, Wisconsin is one of those several states where you can change your early ballot if you think you've made a mistake."
Meanwhile, Hillary Clinton responded to a heckler at a Florida rally, saying: "I am sick and tired of the negative, dark, divisive, dangerous vision and the anger of people who support Donald Trump."
She said: "It's time for us to say no, we are not going backwards, we're going forward into a brighter future."
Supporters chanted her name to drown out the heckler, who was promptly ejected from the rally.
The Democratic presidential candidate also criticised Trump's "conspiracy theories" and said he was a "bully" for criticising women for their looks. Clinton said the Republican candidate had a 30-year history of "demeaning, degrading, insulting and assaulting" women.
Trump has faced a series of sexual harassment allegations in the past month, after a 2005 tape emerged which recorded him making obscene remarks about women.
The Democrats have released a new TV advert claiming Trump is unfit to be president, showing archive footage of the White House hopeful saying: "Putting a wife to work is a very dangerous thing."
In another clip he said: "When I come home and dinner's not ready I go through the roof."