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I think that “wipes out” here is referring to the lead that Trump had in the polls previously. All the states went from a clear lead for Trump over Biden, to basically even, with one exception showing a clear lead.
I think that it suggests a competitive race, rather than one side coasting to victory. It is hard to draw concrete conclusions still, but the clear lead is definitely gone
It is just a public statement of support. There are only consequences to the extent that people care about/respect the opinion and judgment of the person giving the endorsement.
In this case, it’s valuable to RFK Jr in so far as individuals listening to Joe Rogan either think Joe has good insights into who should be president, or just want to be like him and will vote the way they think he will vote