All legal, just as Donald Trump was found to be legal taking complex real estate deductions(IRS has never asked for money back, and trust me, they looked).
Class envy, fear, racism charges, misleading COVID stats. It's all they've got. The Dems offer no reason to vote FOR Biden. They merely oppose Trump. You don't win with that recipe in most cases.
Btw, if the libs are able to win in a consitutionally legal manner, then they will find no greater advocate than Amy Coney Barret. Since they seem so dead set against her (a strict textualist) being involved with any post election SCOTUS case, one must assume that they are planning on cheating. This possibility is further bolstered by the fact that they are now accusing Republicans of planning to cheat with the Mail In election ballots that they insisted on. We all know that liberals accuse others of that which they themselves do, thus their accusations provide a fairly accurate barometer of what they are up to doing.