White voters didn't flee the party. You are the most defeatist and fact-ignoring poster here. If I listened to you or anyone I know did, we would never turn out to vote.
The midterm elections after Obama got elected saw one of the lowest youth turnouts and it happened against in n2014, which was a record low. In other words, all the energy died down and Democrats stayed home. It's not that complicated. Your theory works in like 25 swing districts. That doesn't account for a historic turnaround. Also, Obama was dealing with a recession. You don't tend to do well during a recession or crisis - ask Bush about 2006.

https://www.pewresearch.org/wp-content/uploads/sites/4/legacy-pdf/7-22-11-Party-ID-commentary.pdf
Notably, the GOP gains have occurred only among white voters; a 2-point Republican edge among whites in 2008 (46% to 44%) has widened to a 13-point lead today (52% to 39%). In sharp contrast, the partisan attachments of black and Hispanic voters have remained consistently Democratic.
While Republican gains in leaned party identification span nearly all subgroups of whites, they are particularly pronounced among the young and poor. A seven-point Democratic advantage among whites under age 30 three years ago has turned into an 11-point GOP advantage today. And a 15-point Democratic advantage among whites earning less than $30,000 annually has swung to a slim four-point Republican edge today.
That paper was from 2012 I think.
So yeah, youth turnout was down, but Dems losing white voters was definitely a large part of what happened after Obama was elected. And for the record I've never discouraged anyone from voting, if anything people should be more motivated to vote. It just annoys me when people are naive.
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