(CNN) - CNN is projecting that incumbent Mary Landrieu has won re-election in Louisiana.
Landrieu held a dubious distinction this cycle as the only Democratic senator to face a real re-election threat. The two-term senator - whose two victories have been won by razor-thin margins - faced her toughest opponent yet in state Treasurer John Kennedy.
The Democrat-turned-Republican had the support of Louisiana's popular GOP governor, Bobby Jindal, in a state that strongly supported John McCain.
Republicans had poured hundreds of thousand of dollars into ad buys in the state, pointing to last-minute poll numbers that suggested the race was tightening. But the cash-rich Democratic Senatorial Campaign Committee spent even more, and Landrieu entered Tuesday a heavy favorite.