Lefty California Rep. Eric Swalwell is forcefully pushing back against a lawsuit claiming he can’t run for governor because he doesn’t actually live in the Golden State, calling the accusation “nonsense” and politically motivated. In an exclusive statement to The Post, his campaign’s general consultant said Swalwell has always maintained a California residence. Security concerns tied to repeated death threats against Swalwell explain why a campaign office address was listed on legal filings, according to campaign consultant Kate Maeder. She called the practice legal and common in California politics. Right-wing filmmaker Joel Gilbert, who filed the suit, claims Swalwell actually...