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."