 In recent years, the county's rapid growth in its eastern portion, settled by educated professionals working in or near Washington, D.C., has changed the demographics, and the Democratic Party has become increasingly competitive in the county.After giving Senator Barack Obama nearly 54% of its presidential vote in 2008, the county supported Republican Bob McDonnell in 2009, who received 61% of the gubernatorial vote.Voters also replaced two incumbent Democratic delegates, making Loudoun's state House delegation all Republican.