US Republican presidential hopeful John McCain has picked Sarah Palin, the female governor of Alaska, as his surprise running mate. At 44, she is younger than Barack Obama and is credited with reforms during her first term, but she is relatively unknown in US politics. Mr McCain is due to present her on stage at a rally in Dayton, Ohio, to celebrate his 72nd birthday. Analysts say the Republican is keen to wrest back headlines from Mr Obama. Ms Palin is perhaps the most daring vice-presidential choice for Mr McCain, the BBC's Kim Ghattas reports from Dayton. The two most likely choices were, until recently, former Governor of Massachusetts Mitt Romney and Governor of Minnesota Tim Pawlenty. A staunch opponent of abortion, Ms Palin is married with five children. Analysts say she may have been chosen by the McCain campaign as a tactic to win over Democratic women voters, disappointed by the defeat of Hillary Clinton to Barack Obama. Her relative youth and reforms as governor may also go some way to match Mr Obama's appeal, and boost Mr McCain's chances. "She will be his partner in reforming Washington," a senior McCain official told Reuters news agency, speaking on condition of anonymity. Source: BBC