The Hillary Bernie thing is going to grind on until she gives him some sort of concession. The best olive branch Hillary could extend to the Bernie mob would be to take on Liz Warren as VP, which would pretty much instantly energize the progressive vote into Hillary's favor and de facto unify the Democratic base for not just the Gen, but also for the Senate and House. If she plays her cards right, she could actually roll into the WH with the Senate and possibly the House as well, especially since GOP candidates are mostly running away from Trump.