In what may be the oddest coupling in radio history, former Democratic Congressman Anthony Weiner will be co-hosting a New York show with Guardian Angels founder and former Republican mayoral candidate Curtis Sliwa. The ex-pol — who was sidelined by a number of sexting scandals, and sentenced to 21 months in federal prison for transferring obscene material to a minor — will co-host a new opinion program called “The Left vs The Right” on John Catsimatidis’ 77 WABC Radio starting this weekend. But Weiner says the new high-profile gig isn’t part of a larger comeback plan as a media maven....