Happy birthday, Hillary Clinton! Here's a look inside her evolution from Girl Scout to presidential front-runner

Before she became First Lady, New York's first female US senator, and a viral internet meme, Hillary Clinton was a city girl who dreamed of being an astronaut or a baseball player.

Clinton, for the second time, is seeking the Democratic nomination for president. Bolstered by a strong debate performance, Vice President Joe Biden's decision not to enter the race, and her testimony before Congress last week, she enters into the last two months of the year the clear front-runner to be her party's nominee.

On her 68th birthday, and with her presidential campaign gearing up for the homestretch ahead of the Iowa caucuses and New Hampshire presidential primary in a few months, we decided to take a look back at how Clinton became one of the world's most powerful people.