In that sense, Sanders is trying to replicate the enthusiasm among young people generated by President Obama in 2008 and 2012. Eight years ago, Obama took 66 percent of the under-30 vote in the general election and he did nearly as well in 2012. Obama also beat Clinton among young voters in the 2008 primaries. A combined sample of NBC News exit polls on Super Tuesday that year showed Obama up 16 points over Clinton.
But if Sanders can get those younger voters to turn out in the primaries, they could prove useful in the general election. A December Quinnipiac poll found 18-to-34 year-olds favoring Sanders over both Sen. Marco Rubio (R-Fla.) and Sen. Ted Cruz (R-Tex.) by 29 points each. Clinton led Rubio by 28 points in the same age group, and Cruz by 22.
The Post-ABC poll was conducted Dec. 10-13 among a random national sample of 1,002 adults reached on conventional and cellular telephones. Overall results have a margin of sampling error of plus or minus 3.5 percentage points. The error margin is plus or minus 5.5 points among the sample of 377 Democrats and Democratic-leaning registered voters.