Former Godfather's Pizza CEO Herman Cain (r.) talks with Samuel Joseph 'Joe the Plumber' Wurzelbacher, who made news during the 2008 presidential campaign when he asked Barack Obama about taxes, before speaking at a tea party rally at the Statehouse in Des Moines, Iowa, on April 16. Mr. Wurzelbacher has filed papers to run for Congress in his home state of Ohio. Charlie Neibergall/AP/File
Samuel 'Joe the Plumber' Wurzelbacher speaks during a tax day 'tea party' protest in Lansing, Mich., on April 15, 2009. Mr. Wurzelbacher won a seat on a GOP committee in his hometown of Toledo, Ohio. He is one of nearly 400 committee members who oversee the Republican Party in northwest Ohio's Lucas County. The group elects the county chairman and sets the party agenda. Al Goldis/AP/File
An Israeli police officer shows Samuel Wurzelbacher, who was in the region to report for the conservative pjtv.com Web site, pieces from rockets fired by Palestinian militants from inside the Gaza Strip in the southern Israeli city of Sderot on Jan. 11, 2009. Wurzelbacher became famous after campaigning for US Republican presidential candidate John McCain during the 2008 US elections. Moshe Milne/Government Press Office/AP/File
Samuel Wurzelbacher, also known as 'Joe the Plumber,' poses in the southern Israeli town of Sderot on Jan. 11, 2009. Covering the conflict for PJTV.com, a US conservative website, Mr. Wurzelbacher was in Sderot, a target of rockets from the Hamas-ruled Gaza Strip. Moshe Milner/GPO/Reuters/File
US Democratic presidential nominee Senator Barack Obama speaks to Samuel Wurzelbacher as he canvasses a neighborhood in Holland, Ohio, on Oct. 12, 2008. Mr. Wurzelbacher, a plumber, was mentioned several times in the final presidential debate between Obama and Republican presidential nominee Sen. John McCain on Oct. 15, 2008. Jim Young/Reuters/File
A supporter holds up a sign referring to 'Joe the Plumber' at a campaign rally with Republican presidential nominee Senator John McCain in Springfield, Va., on Nov. 1, 2008. Brian Snyder/Reuters/File
A reveler dressed as 'Joe the Plumber' marches in the annual Greenwich Village Halloween Parade in New York on Oct. 31, 2008. Lucas Jackson/Reuters/File
Republican presidential nominee Senator John McCain is joined by Samuel Wurzelbacher, also known as 'Joe the Plumber,' at a campaign stop in Mentor, Ohio, on Oct. 30, 2008. Brian Snyder/Reuters/File
A woman holds a sign which reads 'Fight for Joe the plumber' as Republican presidential nominee Sen. John McCain speaks during a rally in Miami, Fla., on Oct. 17, 2008. Carlos Barria/Reuters/File
Samuel Wurzelbacher, or as Republican presidential candidate Sen. John McCain dubbed him in a presidential debate, 'Joe The Pumber,' chats with the news media outside his home in Holland, Ohio, on Oct. 16, 2008. Wurzelbacher was cited by the GOP presidential candidate as an example of someone who wants to buy a plumbing business but would be hurt by Democratic presidential candidate Sen. Barack Obama's tax plans. Madalyn Ruggiero/AP/File
Samuel Wurzelbacher watches the presidential candidate debate in his Holland, Ohio home on Oct. 15, 2008. After watching the debate, Mr. Wurzelbacher said he still thought Senator Obama's plan would keep him from buying the small business that employs him. About Senator McCain: 'He's got it right as far as I go.' Lori King/Toledo Blade/AP/File
Samasource breaks down complicated data-processing projects into small steps that can be done remotely on PCs in countries like Ghana, Uganda, and Haiti.
ByCarolyn Abate, Contributor
Sarah Deragon/Portraits to the People/Samasource
Leila Janah was only 17 years old when she took her first trip to Africa. As a high school senior living in southern California, she volunteered to teach English in Ghana as part of a student-volunteer program. She was sent to the village of Akuapem and quickly settled in with students from the area, ranging in age from 11 to 25. Many were blind.