In context it comes off as him just being dismissive of the media, and their penchant for asking questions designed to cause trouble and get soundbites. But I do admit that at this point I am pretty suspicious of most politicians, and the fact he didn't say "He says he's a Christian, and I believe him." will always trigger alarms in my head that tell me he just doesn't want to totally dismiss the Secret Muslim angle. I'm willing to believe the best in even Walker though, because if he was being genuine he is completely correct. Speculating on Obama's religion is not his job as a Presidential candidate.
I would hope it's a sign he's not going to run the kind of campaign we've seen in recent elections, but even if his intentions are good they won't survive long once the PACs and corporate money start rolling.
Oh, definitely, but Hillary is more susceptible than most, she's a rightish hawk compared to most Dems. It just seems to me the Republican brand of it is more entertaining, watching Mitt explain that "Sure, I have done health care reform in my State, but nationally? Never!" or McCain sell his soul to get through the primaries and have any shot in the general election.