Instead of actual substantial healthcare reform, drug pricing was off the table from the start in the course of implementing Heritage Foundation policy a/k/a Romneycare. Etc.
Strib carrying an AP feed, here; WaPo; websearch, here. So?
There are a host of good candidates already declared, Bernie, Warren, others. Who wants Joe? Refried Obama? Move on.
The worse thing that could happen is Biden declaring; the worse general election candidate raising a likelihood of four more Trump years; Biden. A Ms. Clinton of the other gender; unneeded, unwanted.
And that's without going into the atrocious way Biden handled the Anita Hill hearings, allowing Clarence Thomas a top court seat. Noting a great respect for Thurgood Marshall here, the notion that a "black seat" on the top court meant Thomas was okay, offends the legacy of Marshall. Greatly. Biden chaired the hearings, a link.
Counterpunch. CommonDreams. A websearch.
Many reasons. One conclusion. Not Biden.