Gov. Kathleen Sebelius (D-KS) will deliver the Democratic response to the State of the Union on Monday.
And then Tuesday or Wednesday, she plans to endorse Barack Obama, numerous Democratic sources said.
The sources said that Sebelius decided some time ago that Obama was her candidate but decided to wait until after the State of the Union.
An Obama spokesperson declined to comment.
"Right now, the Governor's focus is on delivering her response to the President's State of the Union message Monday night," said Nicole Corcoran, communications director to Sebelius. "The Governor will have more to say about the presidential campaign after Monday."
Fresh off his win in the South Carolina Democratic primary Saturday, Sen. Barack Obama will visit Eldorado, Ks. Tuesday, his grandparents' hometown.
He is also due to appear in Kansas City the same day, one week before the Missouri primary and Kansas Democratic caucus.
Obama will hold a rally at the Butler County Community College Gymnasium. Doors will open at 11:45 a.m, but his campaign said space will be limited. For reservations, call 316-789-5194. No signs or banners will be allowed.
Obama's mother was born at Fort Leavenworth while his grandfather was in the Army during World War II.