After South Carolina on Saturday, Steyer is out, Buttigieg is out, and Klobuchar is out. Buttigieg, Klobuchar and Beto O'Rourke are now campaigning with and endorsing VP Biden in Texas. If there's collusion going on, it's in the Democrat Party going against Democratic Socialist Bernie Sanders. The party is absolutely terrified that Sanders will run away with this. He might be the only one who can win the nomination outright with the number of delegates needed. However, if no one has the delegates, there will be a brokered convention in July. Then the super delegates, a safety net for the Democrat Party, will come in and make it right by picking the candidate that insiders want to win. This could be the reason for the sudden drop out of Buttigieg and Klobuchar who are now campaigning for Biden. The party wants Biden and have targeted Sanders to prevent him from getting the nomination.