4. That is what he did during the debates with Clinton
Once it became clear he was going to win the primaries, he didn't do much during the debates. How many of those debates did clinton "win" because Obama gave a "lackluster performance" while Clinton had "a ton of energy".
If you are ahead by two touchdowns with two minutes left, you don't throw deep passes looking for more chances to score. It is foolish because you don't have to do that. All you do is spike the ball and run out the clock.
Again, Obama's job right now is to plan for the long term and win the election. Most of us are too focused on what is happening right here, right now, attack attack attack, and that is why most of us aren't political advisers or politicians. Being smart wins elections, being a dick doesn't get you anywhere.