There is a YOUTUBE VIDEO which goes over all the relevant information related to this. The only wrinkle is the 'obama administration' comment in Runaways which I have stated on many other sites was because Runaways was never actually stated as being MCU...until it was...one month before season 1 premiered.
All easily explained. Obama was president from 2008 to 2012. When Killian talks about "dodging the president's stance" he doesnt say WHICH president. He could have just meant "in general". All presidents would likely be against Killian's weapons stuff.
January, 2012
Obama sings the Al Green song during his campain, while campaigning against Ellis.
May, 2012
The Chitauri invasion happens. This, in addition to implications in regards to the Roxxon oil spill that happened during Obama's administration has him shaken. He's has not prepared himself for an alien invasion.
November 6, 2012
Presidenial election. Ellis wins against Obama. Obama says, "Hey man, you already won this thing. You're prepared for aliens and stuff? Not me man, I'm out. The office is all yours." Due to the circumstances, Obama is allowed to step down and leave office a few months early.
November 13, 2012 (one week after the election)
The media reports that Obama has stepped down slightly early and has allowed Ellis to take his place.
State of the Union address
Obama: "Hello, American citizens. In 2001, there was a deadly terrorist attack in New York City. A few months ago, New York City was attacked again. By aliens, space aliens! Luckily, a secret organization, called The Avengers, was able to thwart thier plans and send them packing. I apologize that I was ill-prepared for the Chitauri invasion. Human terrorists are one thing, but terrorists from outer space? I'm sorry, I'm still trying to wrap my brain around that. Last week, the great people of The United States of America have elected Matthew Ellis in my place. We've been talking, and we have come to the conclusion that President Elect Ellis would be far more suited to handle any potential further otherworldly threats, with the help of The Avengers. With great sadness, I hope that the people of this great nation will understand, that today will be my final day in office. Any questions you may have will be addressed to and responded by our new president. Ladies and gentlemen, I now present to you, President Matthew Ellis."
Maybe he stays around for a bit to pack up and fill Ellis in on what's been going on. Maybe Ellis witnessed the Captain Marvel events, and from that day forward, devoted his life to understanding superheroes and thier foes. Hey, there's never been a real life alien invasion, so this is all plausable.
December 2012 to January, 2013
Ellis has been president for a little over a month now. He ends up getting kidnapped by Killian during the events of Iron Man 3. Again, I need to watch the movie again to see exactly what transpires in regards to mentions of presidency.
November, 2016
Ellis runs against Hillary Clinton and wins his second term. Ellis is, and has always been a great, well respected president. However, some people want to make history, and elect our first female president. Hey, we had a black guy, so why not a woman now? (That's the only reason I personally voted for Obama, wrong reasons be damned. I don't care about politics at all, but I was tired of seeing nothing but white dudes as president, and I am white myself.) For mainly this reason (still no female president), some of the Runaways are upset. (By the way, I still haven't watched any episodes of Runaways.)