U.S. presidential hopeful Barack Obama hopes to continue his gains against fellow Democratic Party Senator Hillary Clinton, following a sweep of recent political nominating contests.
Obama won Tuesday in Virginia, Washington D.C. and Maryland, as well as in recent contests in Maine, Louisiana, Nebraska and Washington state. He is favored next week in Hawaii and Wisconsin.
For the Republicans, Senator John McCain solidified his grip on his party's presidential nomination after he won in Virginia, Washington D.C. and Maryland. Estimates show he has more than 800 committed delegates, well on his way to the 11-hundred-91 needed for the Republican Party nomination.
After the vote Tuesday, Obama addressed thousands of supporters in Madison, Wisconsin, saying he will not stop until there is change in Washington.
McCain addressed his supporters in Alexandria, Virginia, telling them to "dare not" let Obama or Clinton win the White House.
For her part, Clinton is looking ahead to March fourth, when primaries will be held in Texas and Ohio, both of which have a large slate of delegates. At a campaign rally in El Paso, Texas, she told supporters she has the necessary experience to become president.
Clinton's campaign has been reeling from the recent losses to Obama. A high-level Clinton campaign aide stepped down Tuesday, the second such staff change since Sunday.
Two-thousand-25 delegates are needed to secure the Democratic Party's nomination. Estimates show Obama and Clinton each with around 12-hundred delegates, with Obama slightly in the lead.