Right. However, in a few states, like in Georgia where Cynthia McKinney was defeated in the Democratic primary (thank God), the primaries are open to members of any party. In this case, many Republicans voted for McKinney's rival just so that she wouldn't possibly win. (In case you didn't know, McKinney has said some things regarding the terrorist attacks, etc that has angered many Americans). Just something that has been in the news recently.