Via WaPo Nat's Journal:
The Washington Nationals have agreed to a preliminary deal with 29-year-old free agent Adam Dunn, a signing that would fulfill their offseason-long search for a left-handed power hitter. Two independent sources have told the Post that Dunn will sign a two-year deal, possibly announced as early as tomorrow.
The move we all knew was coming.
UPDATE (4:01 PM) by BK: SI's Tom Verducci reporting that it's a 2-year, 20M dollar deal. (hat tip to RN)