In terms of influencing the polls Bernie did a great job.
When Hillary was at 70% Bernie was at about 18.
Clinton started with 70%, ended with 73.6% / Sanders started with 18%, finished with 26%.
Dude, you are in denial. South Carolina was a lost cause. And now Sanders is 'struggling' to get a lead in the most liberal states, Minnesota and Massachusetts. If he can't do it there, where can he? New Hampshire and Vermont don't count. Sanders is doing much better than ever expected, but he isn't coming anywhere close to winning this nomination.