He ordered a drone strike on an American citizen

"American citizen" is not a protection against designation as an enemy combatant, unless you want to tell a bunch of Nazi volunteers in WW2 that getting shot by the 101st Airborne was actually a war crime against their precious little souls.

and bombed schools, weddings, and hospitals (including a doctor’s without borders hospital).

I suspect you're thinking of an incident in Afghanistan wherein a US gunship hit a Doctors Without Borders hospital. While abhorrent and arguably a war crime, it was not sanctioned by Obama, and Obama, in fact, was a prominent voice in demanding an investigation of the incident.

The only wedding strike I remember was in Yemen, which was a big issue at the time, and resulted in limitations on the military's ability to carry out drone strikes without presidential approval.

The only school strike I can find were performed under Bush, though considering that the Bush Administration did not reveal many of its strikes, there may very well be more.

Obama's drone campaigns were performed with a callous disregard for civilian casualties compared to what they should have been performed with, and US PR worked double-time to try to paint them as civilian casualty-free (claiming something absurd like a 0.2% civilian casualty ratio). That's not the same as saying that Obama targeted schools, weddings, and hospitals.

He extended the patriot act and persecuted Snowden and manning for telling us that the federal government was regularly sidestepping the bill of rights.

1. Those aren't war crimes. Shitty, sure, arguably against international or Federal law. But that's not what a fucking war crime is.

2. 'persecuted Snowden and manning' how so? At best, by not pardoning them? Do you know how the executive and judiciary work in this country? I'm sorry Snowden found it more convenient to go and stick Putin's hand up his ass instead of defending himself in court or fleeing to any fucking legitimate country. I'm more legitimately sorry that Ms. Manning ended up punished for whistleblowing, though I also realize that military prosecutors cannot reasonably say "Oh, well, we think this leak is for a good cause, so we're not prosecuting." A pardon by the executive would have been much better than the commutation she eventually received, and a immediate commutation preferable to the much-delayed one. You want to say that's a terrible sin of Obama's? I'm not in disagreement. But it's not a fucking war crime.