Floridians in Pinellas County on Tuesday voted to send former lobbyist David Jolly to congress.
The special election was held to replace the late Rep. Bill Young, who died last October.
Democrats had hoped to turn the congressional seat blue in the traditionally Republican district, but Sink came up short under a heavy ad campaign against her support for the Affordable Care Act.
It is unclear if Jolly will add to the partisan gridlock plaguing Washington or work across party lines toward compromise.
Since the Republicans took control of the House in 2010, both the 112th and 113th Congresses have been the least productive in history.