The First Amendment does not allow election fraud. Lies about elections are not covered by the First Amendment. Just like slander. Except much more important---elections must be above reproach and are considered sacred. If some can lie with impunity and in doing so tamper with the veracity and fairness of an election there is no constitutional protection.
The U.S. Constitution is not a suicide pact.
You could have worked for Stalin with a line like that one. Do you really want courts to determine what is true and false in politics?