Democratic Senator Barack Obama has swept rival Senator Hillary Clinton in three of their party's presidential nominating contests held Saturday.
Obama won by margins of roughly two-to-one in the midwestern state of Nebraska, the southern state of Louisiana, and Washington state on the U.S. west coast).
Obama and Clinton are in a very tight race for the Democratic Party nomination, with more contests today in Maine, and Tuesday in Virginia, Maryland and the U.S capital, Washington, D.C.
In a speech late Saturday in Virginia's capital, Richmond, Obama said he has shown that he can win in various parts of the country.
In Republican Party contests Saturday, former Arkansas Governor Mike Huckabee won the midwestern state of Kansas with 60 percent of the vote, ahead of Arizona Senator John McCain, who had 24 percent.
Nationwide, Huckabee is trailing far behind McCain, who has won more state races and has more of the delegates needed to secure the nomination.
The Republican race in Washington state is too close to call, with McCain, Huckabee and Texas Representative Ron Paul very close in early results.
Incomplete results in the Louisiana primary show Huckabee with a slight lead.
Some information for this report provided by AP, AFP and Reuters.