FAYETTEVILLE, N.C. (AP) — Democratic presidential contenders are expressing support for a North Carolina congressional candidate in a hotly contested special election that could serve as a bellwether for 2020. Former Vice President Joe Biden and South Bend, Indiana, Mayor Pete Buttigieg tweeted support Tuesday for Democrat Dan McCready. He’s is in a tossup battle against state Sen. Dan Bishop for a vacant seat in North Carolina’s 9th Congressional District. President Donald Trump stumped for Bishop on Monday.