They’re cheering in Allentown, where Pat Toomey’s supporters are gathered. After trailing all night, the conservative Republican has finally taken a lead over Democrat Joe Sestak. With 77 percent of the vote counted, Toomey now leads by 15,000 votes. The problem for Sestak is that virtually all of Philadelphia’s votes are in. That city delivered a massive 275,000-vote plurality for the Democrat, but as the rest of the state’s ballots have come in, Toomey has made up the difference.