Very likely on the Repub side.

Us: No.
Repubs: Maybe.

Git yer ready, there may be shortages....

it will destroy our party. For Sanders to win he has to be ahead in pledged delegates.

She would need 64% of all remaining pledged delegates to reach 2,383 (a majority of all delegates). That is not likely to happen unless Bernie drops out soon.

They will each go into the convention with less than 2,383 pledged delegates. One will have a majority of pledged delegates (more than 2,026). The super delegates will have to fill the gap. That is assuming Bernie doesn't concede before the convention.

In that case, each candidate will make their case, but the pledged leader will almost certainly win the first ballot. Not sure I would call that contested.

will be the nominee. The superdelegates will vote to ratify the will of the voters. Getting the majority of pledged delegates means that you won the primary election and caucus process. The superdelegates will not override that. Most of them do have to run for election, and all of the House members are running THIS year.

They're not stupid people, or they wouldn't be in office. They're Democrats, too, and most have been active in working for Democratic party principles for a very long time. They're not going to overthrow the candidate with a majority of delegate who were selected by the voters. Not a chance.

Now, there may be a few who do stupid things, but not enough to change the outcome.

who is ahead around the 2nd week of June.

In the event the person is ahead after the June 7 primaries, there is less than a 0.0% chance the superdelegates will take it away from her and give it to Bernie Sanders.