Marc Ambinder notes there are now five major Republican Senate candidates who have at least initially refused to answer whether they believe President Obama is actually an American citizen.
"Several of these candidates have later corrected their initial
hesitation, but it is precisely that initial hesitation that contains so
much information about what Republican candidates fear right now. No
doubt that Portman and Marco Rubio know that Birtherism is bullshit. The
gap between their private beliefs and how they articulate them publicly
is fairly wide. I'm not a fan of stories that begin with X 'refuses to
denounce' Y -- I usually skip them. I make an exception here because the
accusation is so reckless, so tied to race and culture, and so stupid
that those who try to Wink at the Birthers are adding potency to a
poison that everyone is forced to gulp."