Over the last few months, David Cohen, a Comcast executive who oversees the telecom giant’s lobbying operation, has cut big checks to Republican candidates while pushing to advance his company’s regulatory agenda. On Thursday afternoon, however, Cohen will open his Philadelphia home to host Joe Biden, helping the Democratic former vice president kick off his bid for the White House. Biden, who announced his bid for the Democratic presidential nomination Thursday morning, has depicted himself as the party’s standard bearer. But he’s planning to roll out his campaign at an event filled with others like Cohen, namely GOP donors and corporate lobbyists. Like other Democratic candidates, Biden is launching his presidential bid with a pledge to reject federal lobbyist cash. But the lobbyists attending his Thursday fundraiser are either unregistered or registered with state entities, not the federal system. As The Intercept previously reported, Democratic co...