They have hardly begun to turn up the pressure on smearing Biden yet. All they have to do is make him look incompetent and corrupt, which doesn’t look to be that hard. Then when voters are choosing between two incompetent people, just enough are going to pick the orange entertaining one. They’re gonna turn it up to 11 on Biden over the next few months, guaranteed. Targets will likely be that he’s too old/unfit/smells kids heads/etc/etc. Doesn’t matter that Trump is 10* worse. The Facebook ads ridiculing Biden won’t put it in a fair context. They will just be ‘lul Biden sux’, and that’s the level of communication that suits millions of voters.
It is exceptionally rare that an MP is specifically selected. It does happen and occasionally we see an independent as a result but most of the time its simply team voting and even then it is mostly voting for one prime minister versus another, it is all about the personalities involved. Given our system gives that prime minister and his office effectively all the power to do whatever it wants the public is right to make decisions on that basis. Grayling is nothing more than something to pin a rosette to.