Bush's margin of victory in the popular vote was the smallest ever for a reelected incumbent president, but marked the first time since his father's victory 16 years prior that a candidate won a majority of the popular vote. The electoral map closely resembled that of 2000, with only three states changing sides: New Mexico and Iowa voted Republican in 2004 after having voted Democratic in 2000, while New Hampshire voted Democratic in 2004 after previously voting Republican. In the Electoral College, Bush received 286 votes to Kerry's 252.
Try to answer this question if possible (otherwise reply "unanswerable"): Which state switched sides and embraced the Democratic party after previously choosing the Republican party?
New Hampshire