I won't specifically defend Biden here (only generally later) because he definitely has misrepresented his academic accomplishments in the past (though he actually DOES have a college degree plus a JD whereas Santos has NOTHING).
As far as Warren goes, she didn't lie...she said what was told to her her whole life growing up...that she had Native American blood in her...and, in fact, she does...just not enough for the Cherokee nation to accept her as "part Cherokee." Her DNA (that she voluntarily took by the way) showed she has Native American ancestry anywhere from 6 to 10 generations back.
The level of lying that George Santos (or Anthony Devolder or whatever the hell his actual name is) is off the chain and not in the same ball park as the embellishing Biden has done. He has lied about EVERYTHING. He never went to college even though he said he attended two. He didn't work for the companies he said he worked for. His mother didn't die on 9/11 or in either of the other two ways he said she did, and on and on and on with this guy. A real embarrassment to the Republican Party (well, if it can even feel embarrassment anymore).
Finally, regarding Biden, we all knew that about him when we voted for him (err...voted AGAINST Trump). We have Biden because Trumpers voted for Trump in 2016, thus beginning the most corrupt and criminal White House in our nation's history, and so Democrats, Independents and even many Republicans came together to nominate and elect the most plain vanilla Democrat we could find...an old white guy moderate named Joe Biden. He has actually surpassed my expectations as President, though he should be held accountable for taking and/or housing those classified documents. BUT, the reason we have Biden, a guy that Democrats have rejected before for the top job, is because of Trump. Biden could beat Trump...and he did.