Newsweek forbids donations, generally.Hey Newsweek, Kos Is A Campaign Donor
"We have an expectation that Newsweek journalists will not make any contributions to political campaigns," said spokeswoman Jan Angilella. "Are there exceptions to this general expectation? Yes. Depending on the particular circumstances, including an employee's or freelancer's specific role or responsibility."
Just to make clear to the folks at Newsweek in case they haven't read his blog or this one closely enough: Kos has helped raise money for candidates and donated money to them himself.