We should not start wars to help leaders get elected. 

As you read this, Iran is currently conducting military exercises with China and Russia. Is this a good time to be bombing them ? Also remember that Iran has been working on nuclear weapons for decades.  One more thing. Teenagers in garages across America have built home made a-bombs already. Is it ever a good time to go bombing people who could easily set off nukes in NY or LA or just about anywhere ?
Well, that depends. 

It's probably harder to impeach a president during a war. Especially if the bad guys are blowing up our cities.  So yeah, go ahead and support your president.  Enjoy your stock market gains and reduced regulations on your businesses.  Most of the people who are likely to get blown up are liberals anyway.