Re: Hatch Act, politically motivated violation of.
Are you really suggesting it is "unseemly" for Obama to publicly support Clinton? I guess you must have forgot about Reagan campaigning for Bush back in the day? The reason Clinton didn't campaign for Gore and Bush Jr. didn't campaign for McCain is because they were both quite unpopular by the end of their terms, and Gore/McCain didn't want their help!
It is a time honored tradition for presidents to campaign for their party's successor, or their party's congressional candidates, governors, etc. This is why the Hatch Act specifically exempts the president and vice president.
Biting the hand that feeds IT
