What's happened is that a large enough percentage of the population now votes based on whatever group they identify with and which party promises to do the most for that group that a president with one of the worst records in US history can win re-election purely because he was better able to convince those groups that he was "for them".
When has that not been the case? You can't "murder" each other during primaries then all of the sudden support the nominee as "the best person for the country". Both sides do that and you'll see it in full motion in 2016.
In the identity politics game, the Left will always have an advantage over the Right simply because it's much harder to convince people that a small government platform benefits their group more than a big government platform will. Let's face it, it's pretty hard to convince a group of people that the government *not* giving them stuff is really better for them.
That's just nonsense that Conservatives tell themselves to make them feel better. Most people of the nation, to include the left, share similarities in values. The reason why Republicans lose is that they besmirch their own reputation by their "holier than thou" attitudes that the poor and middle class are lazy bums wanting handouts from the government. The reality is, people of ALL classes find ways to "cheat the system" and to pretend that welfare is the only way people cheat the system is delusional drivel.
But ask yourselves what you really won.
Four more years.