Not too early to see patterns.
Sure, there is much that we can't predict... but so far the President has strong enough approval that if he had to campaign for re-election he would win. Basically he is doing nothing to hurt the chances of any Democrat running for re-election or election to an open seat for State governorships or the US Senate.
So far I see Hillary Clinton winning everything that Barack Obama won in 2008 and 2012 together except perhaps Colorado (fishy poll), which would be good for being elected President. Add to that, she seems to be cutting into some of the huge margins by which President Obama was defeated in some states that went for her husband but went strongly for McCain in 2008 and Romney in 2012.
For the Republicans to win in 2016, Barack Obama must implode as President -- or the political culture must shift strongly to the benefit of the Hard Right. The cultural shifts that made Reagan and Dubya possible were right-wing religious revivals among young-to-middle-aged people -- and if you know anything about current young adults, large-scale right-wing religious revivals among the youngest voters are highly unlikely.
So far, Hillary Clinton projects to win Florida, New Hampshire, Ohio, Pennsylvania and Virginia.