Final answer:
When signing a voter declaration on a voting registration form, voters are certifying all of the following things except their political affiliation as Republican or Democrat.
Step-by-step explanation:
When signing a voter declaration on a voting registration form, voters are certifying that they are at least 18 years old, that they have filled out the form truthfully, and that they are a citizen of the United States. The exception in this case is option 2: they are not required to declare themselves as a Republican or Democrat.