A decade-old FBI investigation casts light on the tight-knit political world from which the former vice president emerged. hristopher Tigani was a wealthy beer distributor who relished his close ties to Delaware politicians, particularly Joe Biden, when the FBI confronted him outside a Royal Farms gas station in September 2010. Tigani was in trouble. While serving as a bundler for Biden’s aborted 2008 presidential campaign, he had reimbursed his employees for contributions made in their names, a well-worn tactic for circumventing campaign-finance laws. Advertisement What happened between that day and Tigani’s 2012 sentencing has never before been revealed: He would...