HONOLULU -- Hawaii's 29 delegates could be key to the Democratic presidential race.

Hawaii Democrats, voters registered as party members, will vote to determine how many of their 20 delegates will pledge to either Sen. Barack Obama or Sen. Hillary Clinton at the party's national convention in August. Hawaii's nine other delegates can remain uncommitted up until then.

For the first time, a presidential campaign is airing ads in Hawaii encouraging people to vote in the Democratic caucus.

"This ad buy and all of the efforts we are putting forth show that Hawaii does matter. It is in play, and in terms of delegates, we have a role to play," Obama's Hawaii spokesman Brian Schatz said

Schatz said their main focus now is to urge supporters to attend the Hawaii's caucus.

"We are running phone banks every day. We have hundreds of volunteers getting the word out, making sure people can check their locations," Schatz said.

Clinton's local supporters said she is not expected to buy TV time in Hawaii.

"We are just going to continue to do what we have always said what we are going to do, which is concentrate on Feb. 19 and get out as many people as we can who are Hillary Clinton supporters," Clinton Hawaii spokeswoman state Sen. Colleen Hanabusa said.

Sen. Dan Inouye, an early Hillary Clinton supporter, plans to return to Hawaii to vote in the Hawaii caucus, officials said.

Many people do not know how they get to vote in Hawaii's Democratic caucus on Feb. 19. You have to be a registered voter and a registered member of the Hawaii Democratic Party.

What if you are not a member of the party? You can register in two ways. The Hawaii Democratic Party is providing an online form for voters to register with the party. (Democratic Party Membership Online Form)

Officials hope many voters will register ahead of time so they can be prepared at the polling sites. You will want to check where the sites are ahead of time because the polling places are not necessarily the same locations where you vote in an election. (List Of Polling Sites)

Democratic officials said voters can also register at the polling sites on the day of the caucus. The caucuses are scheduled to start at 7 p.m. and end at 7:30 p.m.

Hawaii GOP Votes Done Until RNC

Hawaii Republicans finished their two weeks of caucuses on Tuesday night.

Hawaii GOP caucuses are not "preference polls," but meetings to select delegates to the state convention.

Hawaii will send 20 delegates to the Republican National Convention in September. Hawaii's GOP delegates can remained uncommitted until then.