Right-wing Fox News has had plenty of turnover during its 28-year history. But “Fox & Friends” co-host Steve Doocy, like Sean Hannity, has been with the right-wing cable TV outlet since 1996 — the year it was launched. And Fox News chose Doocy as a “Fox & Friends” co-host in 1998. Politically, Doocy is clearly on the right; his politics have always been conservative. But the Washington Post’s Jeremy Barr, in an article published on March 18, stresses that in recent months, Doocy has been “the resident dissenter” on “Fox & Friends” and “a rare member of the Fox News opinion wing who is challeng…