Trump-endorsed Tshibaka takes on Alaska's Murkowski in closely-watched Senate race

Republican Alaska Sen. Lisa Murkowski faces a challenge from her own party as Trump-endorsed opponent Kelly Tshibaka aims to unseat the longtime incumbent.

But Tshibaka argued it is time for a change. She noted that a Murkowski has held the Senate seat since 1981; before Lisa Murkowski, it was her father, Frank Murkowski.

Murkowski said she felt good about her campaign and the support she's received but said voter turnout is key. She said in 2010, many of her supporters "kind of took for granted that I was going to be OK," and she lost her Republican primary to tea party upstart Joe Miller. She ultimately held onto the seat with a general election write-in campaign that year.