American cast their votes

[Odessa Dawn]

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With only days left until American cast their votes, the Obama campaign has sent Emanuel, who served as White House chief of staff for the administration's first two years, on a mission to the two most influential swing states – Florida and Ohio.


More:Rahm Emanuel: Obama will protect Israel, deal with Iran - Israel News, Ynetnews

The pronoun their is possessive form of they while in the above text being used as possessive form of s/he. Isn't Americans the plural form of American?
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American adj, n - definition in American English Dictionary - Cambridge Dictionary Online

 

[bhaisahab]

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With only days left until American cast their votes, the Obama campaign has sent Emanuel, who served as White House chief of staff for the administration's first two years, on a mission to the two most influential swing states – Florida and Ohio.


More:Rahm Emanuel: Obama will protect Israel, deal with Iran - Israel News, Ynetnews

The pronoun their is possessive form of they while in the above text being used as possessive form of s/he. Isn't Americans the plural form of American?
​

American adj, n - definition in American English Dictionary - Cambridge Dictionary Online

It should be "Americans".