A foolish journalist asked attack-dog questions of Joe Biden recently, asking whether Obama's positions were socialist and comparing them to Karl Marx. The questions were stupid because they assume some bright line exists between socialism and the redistributionist aspects of American policy that have been in place since the Great Depression. However, it's fair to take public statements and critique them. An unfair question would've been to use made-up evidence from wingnuts that Obama is a secret socialist as the basis of an accusation. It was inappropriate for the Obama campaign to cut off access to that TV station, and I wish American politicians were forced to tolerate the same level of persistent questioning that you see in Britain.
OTOH, the same newscaster only asked McCain why he was insufficiently negative about Obama, so she's a piece of work.