The 20-foot white fir, from a Pennsylvania tree farm, arrived in a horse-drawn wagon.
Blog Briefing Room
Activists called for boycotts of major retailers to draw attention to racial injustice.
A TV station reports seven people were arrested as they broke from a protest route.
The White House dessert menu has been scaled down from last year.
The 81-year-old Supreme Court justice had a heart stent implanted.
The long Thanksgiving holiday weekend is going to be dominated by one story.
The president will spend the day "eating some good food and watching a little football."
Rev. Al Sharpton invited the parents of Michael Brown.