WASHINGTON (CNN) - Nebraska Sen. Ben Nelson, a conservative Democrat, will endorse Illinois Sen. Barack Obama for president, two Democratic sources tell CNN.
One of the sources, a Nebraska Democrat, said Nelson decided to back Obama because he “agrees with Obama’s philosophy of ending the partisan divide in Washington.”
Massachusetts Sen. John Kerry and South Dakota Sen. Tim Johnson endorsed Obama on Thursday.
Nelson’s fellow Nebraskan, former Sen. Bob Kerrey, previously announced his support for New York Sen. Hillary Clinton in the race for the Democratic nomination.
Nebraska Democrats hold their caucuses on February 9, a potentially important presidential contest if Democrats do not choose their nominee by February 5, otherwise known as “Super Tuesday.”
The sources said the announcement could happen as early as Saturday.
–CNN Political Editor Mark Preston