Louisiana's Bill Cassidy successfully defends his Senate seat from a variety of challengers

• First-term incumbent Louisiana Sen. Bill Cassidy fended off several challengers in his reelection for the US Senate, according to Decision Desk HQ results.
• Cassidy was first elected in 2014 after defeating his second-place opponent by 11 percentage points.
• Louisiana overwhelmingly voted for President Donald Trump in the 2016 presidential election.
• See the live coverage and full results from the U.S. Senate elections.

First-term incumbent Sen. Bill Cassidy defended his Senate seat against a variety of challengers, according to Decision Desk HQ results.

Cassidy is in his sixth year as a member of the US Senate. He was first elected in 2014 after defeating Democratic incumbent Mary Landry, among a swath of other candidates, by over 11 percentage points.

Louisiana elections rely upon a majority-vote system, where candidates of all parties compete against each other in the same race but must win over 50% of the vote. If no candidate broke the 50% mark, a follow-up election would have occurred on December 5 between the top two vote-getters in November.

In the 2016 presidential election, the state voted for President Donald Trump over Democratic nominee Hillary Clinton by 19.7 percentage points.

Sabato's Crystal Ball with the University of Virginia Center for Politics ranked the race as "safe" Republican.

See Insider's full guide to the race for the US Senate here.