is Obama automatically obliged to support/campaign for Biden?

[© Tweed the Younger]

is Obama automatically obliged to support/campaign for Biden?

[BeccaM]

Obama wins: doesn't care who the next Democratic nominee is

Obama loses: doesn't care who the next Democratic nominee is unless he decides to run again himself

[Mr. Morden]

No, not at all.  Obama won't endorse anyone in the 2016 primaries.

[Sol]

Nope.

[The Ex-Factor]

Obama, in the words of one Democratic panjandrum, “couldn’t possibly be more disengaged from the question of party succession—he just doesn’t give a sh**t.”

[hcallega]

Presidents rarely get too involved in the succession process. If there's an open primary, than Obama would do more harm than good if he intervened. That would be especially the case if both Biden AND Clinton run. Both are members of his cabinet, and both would be entitled some degree of support. Therefore, he probably wouldn't give support to either candidate to prevent any sort of blowback from the other.

[© Tweed the Younger]

Presidents rarely get too involved in the succession process. If there's an open primary, than Obama would do more harm than good if he intervened.

when's the last time a sitting president did not endorse his VP?

[© Tweed the Younger]

wow it looks like Reagan did not until May 1988.

http://www.nytimes.com/1988/05/12/us/reagan-endorses-bush-as-successor.html

of course Obama will be thinking lucidly and making his own decisions.

[Mr. Morden]

wow it looks like Reagan did not until May 1988.

http://www.nytimes.com/1988/05/12/us/reagan-endorses-bush-as-successor.html

of course Obama will be thinking lucidly and making his own decisions.

1988 and 2000 are the only two examples you have under the modern primary system, where a sitting VP ran for president.  And in 2000, the entire party establishment was behind Gore, in a way that wouldn't happen with Biden.