DENVER (AP) — John McCain tapped little-known Alaska Gov. Sarah Palin to be his vice presidential running mate on Friday in a startling selection on the eve of the Republican National Convention.

Two senior campaign officials disclosed Mccain’s decision a few hours before the Republican presidential nominee-to-be and his newly-minted running mate appeared at a rally in swing-state Ohio.

Palin is a self-styled hockey mom and political reformer who has been governor of her state less than two years.

Palin’s selection shocked numerous Republican officials.

In making his pick, Mccain passed over several more prominent prospects who had figured in speculation for months — Minnesota Gov. Tim Pawlenty, former Massachusetts Gov. Mitt Romney and former Pennsylvania Gov. Tom Ridge among them.

At 44, Palin is a generation younger that Sen. Joseph Biden of Delaware, who is Barack Obama’s running mate on the Democratic ticket.

She is three years Obama’s junior, as well — and McCain has made much in recent weeks of Obama’s relative lack of experience in foreign policy and defense matters.

Palin flew overnight to an airport in Ohio near Dayton, and even as she awaited her formal introduction, some aides said they had believed she was at home in Alaska.

She is a former mayor of Wasilla who became governor of her state in December, 2006 after ousting a governor of her own party in a primary and then dispatching a former governor in the general election.

More recently, she has come under the scrutiny of an investigation by the Republican-controlled legislature into the possibility that she ordered the dismissal of Alaska’s public safety commissioner because he would not fire her former brother-in-law as a state trooper.