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CNN Chief National Correspondent John King spent some time atop a wind turbine in Hawaii for his latest American Dispatch report about alternative energy. (Photo Credit: CNN)

Related: Hawaii in early stages of energy evolution

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Washington (CNN) – Rep. Neil Abercrombie, D-Hawaii, said Friday that he will formally announce his retirement from Congress this weekend so he can focus on his run for governor next year.

Abercrombie has scheduled a press conference for Sunday.

"I cannot claim the Governorship should be a cornerstone of our democracy and not make the campaign for it the center of all my efforts," Abercrombie said in a statement posted on his campaign Web site.

The 10-term congressman said he already shared his decision with the White House, Speaker of the House Nancy Pelosi and other members of Hawaii's congressional delegation. Abercrombie's move will trigger a special election to fill the remainder of his term.

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(CNN) - Voters in the latest battlegrounds for the Democratic presidential nomination faced very different treks to polls and caucuses Tuesday. Wisconsin voters braved single-digit temperatures and a windchill advisory while Hawaii caucus-goers expected to enjoy temperatures in the 80s.

Both groups will shape the course of the tight race between Democratic Sens. Barack Obama and Hillary Clinton, while Wisconsin and Washington state voters could help Sen. John McCain finally knock his last major rival out of the Republican race.

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Chelsea Clinton campaigns for her mother in Hawaii. (Photo Credit: Bethany Swain/CNN)

WAILUKU, Maui, Hawaii (CNN) - Chelsea Clinton greeted more than a hundred people Sunday afternoon in Wailuku, a city on the Hawaiian island of Maui. From the moment she arrived at the rally, attendees welcomed Clinton with leis and hugs.

A local cheerleading squad performed a routine they choreographed just for Clinton's visit to the island. After a group of local girls danced a hula, Clinton was invited to try the local tradition. After some encouragement from the crowd, a reluctant Clinton went to the very back of the stage and joined in, along with other local Democratic leaders. She was still wearing her dark high heels.

Later, the Stanford graduate thanked the crowd for its support of her mother's presidential campaign and encouraged them to particpate in Tuesday's caucus. She vowed to practice her hula skills before returning to Hawaii.

After the rally, the 28-year-old spoke with attendees and posed for pictures.

Related video: Aloha! Hawaii's in play.

–CNN Photojournalist Bethany Swain

Chelsea Clinton campaigned for her mother in California in early February.

(CNN) - As part of the Clinton campaign's declared effort to fight for every delegate in every state, Chelsea Clinton is heading to Hawaii, Barack Obama's home turf, according to a Clinton campaign source. She'll spend three days, including this weekend, campaigning there.

The Clinton campaign has been criticized for not competing in the smaller states and caucuses, but is now trying to adjust their strategy. A campaign source says they are not focused only on Texas and Ohio.

On conference call Wednesday, Clinton staffer Guy Cecil said the campaign would now be hiring staffers and opening field offices in several states with upcoming contests they had not devoted resources to before, including Montana and Wyoming.

Hillary Clinton has been endorsed by Sen. Daniel K. Inouye of Hawaii, and will be doing satellite interviews with Hawaiian TV today.

A campaign source says Chelsea has proven to be an effective campaigner and they see a strong correlation between Chelsea's visits and improved performance.

At this point, says one campaign source, it's a delegate fight, and even narrowing a loss has a huge impact.

This cycle Chelsea campaigned for her mother in California – the first state where Clinton won the youth vote. The rural congressional district where Chelsea campaigned in Nebraska outperformed others in the state. So far this cycle, Chelsea Clinton has campaigned in at least 15 states.

–CNN’s Jessica Yellin