Less of a diary than a small resource. This is the first competitive Democratic primary since 2008, and there are obvious parallels between that competition and this, not least the identity of one of the contenders.
So how great are the similarities? Here’s national polling of the major contenders for the 2007 and 2011 primaries, aggregates and smoothing from Pollster. To be honest, supporters of both significant candidates this time around might find something cheering in this. Sanders approximates or exceeds Obama’s performance. Clinton 2016 is in a stronger position than Clinton 2008.
A few notes: Clinton 2016’s downward bump matches “peak Biden.” Obama 2008 would continue that upward swoop to settle at a little over 50% for the rest of polling. Clinton 2008 would remain at a little over 40%.