Here. Take this postage stamp and pen to note and highlight Obama's presidential career then get back to me.
Killed Bin Laden. Created a treaty with Iran that prevented them from acquiring nuclear weapons, already resulting in some good faith interactions from a country that would otherwise be a nuclear threat at this point.
3,222 air strikes against Isis resulting the destruction of 58 tanks, 184 Humvees, 673 fighting positions and 980 buildings or barracks. All without large scale deployments that would have actually cost military lives. Right now Isis has been soundly beaten up and are in preparation to lose their beloved Caliphate.
Obama has normalized relationships with Cuba, repealed the abominable "Don't ask, Don't tell" policy. Most importantly we've lost significantly less soldiers in his 8 years in office than we did during his predecessor's. Even the gaffes like Libya were completed cleanly without the loss of US lives.
But I'm sure a Trump, who shits on gold star families, shits on POWs, lies about donations to veterans, doesn't know what the nuclear triad is, doesn't understand the nuance of nuclear treaties, doesn't know Russia is in Ukraine, hires Russian friendly advisors, wants to pull us out of NATO, wants to tank the world economy by negotiating the national debt, can't even assemble a decent campaign staff, and has the temperament of an angry toddler is a much better option. Based on his complete lack worth of real world accomplishments, other than launching a clothing line and a reality TV show.