The move could give Democratic officials more flexibility to deal with the changing primary calendar. More than a dozen states have delayed their primaries, some of them pushing beyond the party’s existing June 9 deadline to hold contests and the June 20 deadline to name convention delegates. Violating those deadlines can cost a state up to half its convention delegates. The party’s rules and bylaws chairman, Jim Roosevelt, said Thursday that his full committee will consider waivers to the existing deadlines as they are submitted by state Democratic parties.