Since 1972, Iowa has been the first state to vote in presidential primaries, with their caucuses.
The modern presidential campaign begins before the primary elections, which the two major political parties use to clear the field of candidates before their national nominating conventions, where the most successful candidate is made the party's nominee for president.
Conversely, states that traditionally hold their primaries in June, like California (the most populous state overall) and New Jersey (the most densely populated state), usually end up having no say in who the presidential candidate will be.
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A few states once staged a blanket primary, in which voters could vote for one candidate in multiple primaries, but the practice was struck down by the U.S. Supreme Court in the 2000 case of California Democratic Party v. Jones as violating the freedom of assembly guaranteed by the First Amendment.
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