Commentary: Sam Donaldson Says 'John McCain Is in Trouble'

Sam Donaldson, a 41-year ABC News veteran, served two appointments as chief White House correspondent for ABC News, from 1977-1989 and from January 1998 to August 1999, covering Presidents Carter, Reagan and Clinton. Donaldson also co-anchored, with Diane Sawyer, "PrimeTime Live," from August 1989 until it merged with "20/20" in 1999. He co-anchored the ABC News Sunday morning broadcast, "This Week With Sam Donaldson & Cokie Roberts," from December 1996 to September 2002. Currently, Donaldson appears on ABC News Now, the ABC News digital network, in a daily show called "Politics Live."

(Vote '08)

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