(CNN) - President Barack Obama addressed via video conference several Democratic caucus sites in Iowa Tuesday, four years after winning the state's contest in a surprise victory that fueled his campaign on a path to the nomination.
"We've still got a lot of work to do. But think about the change that was accomplished because of those caucuses four years ago," Obama said.
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Among the accomplishments he listed since taking office, Obama touted the withdrawal of troops from Iraq, the passing of health care reform and the repeal of "Don't Ask, Don't Tell."
The president joked that he has since grown more "gray" but said he's more optimistic about the ideas of "hope and change" that he trumpeted in his last run.
"We've already seen change take pace," Obama said. "2012 is about reminding the American people how far we've traveled."
Obama took part in the video conference from the Capital Hilton in Washington, using a system called Adobe Connect.
His comments came as results poured in from the Republican Iowa caucuses, the first GOP presidential nominating contest of the cycle.
Taking questions from supporters, Obama took a shot at Republicans for supporting "tax cuts for the wealthiest among us."
"It's going to be a big battle, though," he added. "I hope you guys are geared up. I'm excited."
While the Republican candidates have been campaigning heavily in the Hawkeye State for much of the last year, national Democrats and the Obama re-election team have also been laying down a strong network across the state ahead of the general election in November.
In 2008, Obama won Iowa by nine percentage points over Sen. John McCain.
According to the Iowa Democratic Party, more than 25,000 Democrats turned out to caucus on Tuesday, with more than 7,500 people signing up to volunteer for the Obama team.
"We not only saw how excited Iowans are to support President Obama, but to also work for his reelection. The Iowa caucus was a great opportunity to test our campaign organization and expand our volunteer base as we move toward November," said the party's Iowa chairwoman, Sue Dvorsky, in a statement.
– CNN's Jessica Yellin contributed to this report.