Former Rep. Anthony Weiner is laying the groundwork for a political comeback, possibly as a startling addition to this year’s mayoral race, sources said yesterday. Political insiders were abuzz at news that Weiner and his wife, Huma Abedin, had granted a lengthy magazine interview for the first time since his resignation in an embarrassing sexting scandal in 2011. “The magazine piece is step one of a two-step process for him to run citywide this year,” said one Democratic Party source. “He’s looking at public advocate and comptroller, but he really thinks he can use this to get back in and...