As Obama's many gaffes didn't make any difference, it won't make a difference for the people determined to vote for Biden. All is excused when it's your boy making the mistakes.
It just remains to be seen if the closing of ranks will be enough to derail Comrade Bernie.
At any rate, if this means a lot of scuffling or more dire "things" happening at the Dem convention in July, I'm stocking up on the popcorn.