Clark struggled to recall anyone in his area who ever identified as a Republican. Though that is not something anyone would likely volunteer to a Democratic ward leader, Clark eventually remembered Lewis Harris, the GOP leader in the nearby 29th ward, and that rare species: an urban black Republican.
Harris, in an interview, said he works for the GOP mostly because he believes city neighborhoods need attention from both parties.
"I open the door to the community and let them be exposed to diversity in the political party," Harris said. "I want political community-based leverage."
Harris cast his vote for Romney, but he's also an Obama fan.
"I love both of those people," he said.
Nationally, 93 percent of African Americans voted for Obama, according to exit polls, so it's not surprising that in some parts of Philadelphia, the president did even better than that.
In the entire city, Obama got 85 percent of the vote. His worst showing was in South Philadelphia's 26th Ward. There, the president garnered 52.3 percent of the vote, compared to 46.6 percent for Romney.
Paula Terreri, 57, a 26th Ward Republican who describes herself as a devout Catholic, said outside the polls on Tuesday that she voted for Romney because she opposed abortion.
Many parts of Philadelphia and other big cities simply lack Republican voters, a fact of campaigning that has been true since Franklin D. Roosevelt's New Deal, Stanford University's Rodden said.
In 2008, McCain got zero votes in 57 Philadelphia voting divisions. That was a big increase from 2004, when George W. Bush was blanked in just five divisions.
As the first African American president, Obama held immense appeal to black voters, but skin color is only part of the story, said Mark Sawyer, a political science professor at UCLA.
Previous Republican candidates, including Richard Nixon and Jack Kemp, supported affirmative action and urban development, but their party has abandoned those stances, Sawyer said.
Romney's comments, including talking about people who want "more free stuff from the government" after a visit to the NAACP, only further distanced African Americans who felt the comments played to stereotypes about welfare, Sawyer said.
Inquirer Staff Writer Bob Warner contributed to this report.