Why Sarah Palin is probably serious about challenging GOP Sen. Lisa Murkowski

Sarah Palin is back, and she's coming for Sen. Lisa Murkowski (R-Alaska).

On Friday, the Republican senator affirmed she'd vote against Supreme Court nominee Brett Kavanaugh, saying she made her decision based on "issues ... bigger than a nominee." Sen. Susan Collins' (R-Maine) support for the nominee quickly negated Murkowski's "no" vote, but one vice presidential hopeful turned reality show star wasn't about to let it go.

Palin's tweet looks like a succinct suggestion that she'll challenge Murkowski when she's up for re-election in four years. It's not hard to imagine, either, because the senator and the ex-governor have history. Palin is the woman who, in 2006, defeated Murkowski's father in a Republican primary to become the first female governor of Alaska. Frank Murkowski had served just one term as governor after a long stint in the Senate, though he actually appointed his daughter to fill his seat when he won the governorship in 2002.

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Lisa Murkowski has remained in the Senate ever since, even losing the GOP primary in 2010 only to win re-election as a write-in candidate. So Palin, despite definitely having a few more canceled TV shows under her belt, is going to have to bring it.