Obama appealed to a broad swath of individuals across America that why he won by nearly 10 million votes. Your president and party are the only who plays to there base because their ideas don't appeal to anyone unless they cheat or make hidden tones of racism.
The first time before moderates realized the guy was pretty far left. He only won by 4 million the 2nd time. Even with a weak candidate like Romney Obama did not win reelection by that good of a margin. Obama was the most racist president we've ever had. Almost everything he did divided us by that.
I-......If you think the main reason Obama won by a large margin in 2008 compared to 2012 is because of his “appeal to the base”, then I suggest taking either a history class, or just googling the context of both elections.