Who knew that Liz and Caribou Barbie had so much in common?
New York (CNN) -- Liz Cheney, whose upstart bid to unseat Wyoming Sen. Mike Enzi sparked a round of warfare in the Republican Party and even within her own family, is dropping out of the Senate primary, sources told CNN late Sunday.
Cheney, the eldest daughter of former Vice President Dick Cheney, began telling associates of her decision over the weekend and could make an official announcement about the race as early as Monday.
Cheney's surprising decision to jump into the race, an announcement made in a YouTube video last summer, roiled Republican politics in the Wyoming, a state Dick Cheney represented in Congress for five terms before moving up the Republican food chain in Washington.
Enzi was a low-key presence in Washington who was elected in 1996 and, with few blemishes, amassed a conservative voting record in the Senate. He expressed public annoyance at Cheney's decision to mount a primary challenge. A number of his Senate colleagues quickly rallied to his side and pledged support for his re-election bid.
There was little public polling of the race, but two partisan polls released last year showed Enzi with a wide lead, an assessment mostly shared by GOP insiders watching the race.