In some states they can if they choose to do so.
The following are open primaries or caucus states:
Alaska (Dem only), Alabama, Arkansas, Georgia, Hawaii, Idaho, Indiana, Louisiana, Michigan, Minnesota, Mississippi, Missouri, Montana, North Dakota, Ohio, South Carolina, Tennessee, Texas, Utah (Dem only), Vermont, Virginia, Washington, West Virginia (but not Dem's...Rep's use a "convention" system here open to independants), Wisconsin.
Other states one can but it will change their party affiliation or who are not registered in any party:
California, Iowa, Massachusetts, New Hampshire.
Closed primaries:
Arizona, Colorado, Connecticut, Delaware, DC, Florida, Illinois, Kansas, Kentucky, Maine, Nebraska, Nevada, New Jersey, New Mexico, New York, North Carolina, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Dakota, Utah, Wyoming.
Different states have varying laws about when one must be registered with a particular party etc. to vote in that primary so one would have to check with the state to be certain one could vote in the coming election but this is the general layout of the states.
From: http://answers.yahoo.com/question/index?qid=20080122233532AAovnQv
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A political independent is a person who is not affiliated with an organized political party. I am a registered voter but my Voter Registration Card lists my Party as "NPA" (No Party Affiliation). In my state, if I registered as a Democrat or Republican, I could vote in the party primaries for my stated party. Because I am an Independent, I cannot vote in primaries but I can vote in general elections and on referendums and non-partisan races.
No, you don't have to be a registered democrat to vote in the primary.
why can't you vote in the primary election for either a democrat or a republican if you register as a republican? would it not be better to register as a democrat and be able to vote either way than to register as a republican and be limited?
republican mostly
Primaries are closed. Republicans and Democrats only vote for their candidates. Independents etc. can still vote in the primary only for public questions. Independents etc. can vote for who they want only in the general election. If an Independent is running in the primary you can only vote that parties candidate. The same with Green Party etc.