Heck no, the establishment was supporting them, not Trump.Nah, you're making unsubstantiated claims. All Congressmen make money and have opportunities to make money. But, in this country when it comes to candidates running for presidency there are laws in place to prevent them from raking in money like you think. But, like I said they have other opportunities that don't involve running for President to make money.
In this case endorsing Biden means nothing. They are democrats and the democratic party wants Biden to be their frontrunner. Just like when Republicans like Marco Rubio, Ted Cruz and others endorsed Trump once they dropped out. Did Rubio and Cruz get something in return just based off notion they dropped out and endorsed Republican Party candidate?