The fact that Kingston got in the race should be the final nail in the coffin for the "Baker for Senate" conspiracists.
Nothing surprising here, except that Ayyadurai is still being polled as an R. He's running independent.
Baker is better off running in 2020 against Markey anyways. Even if he ran he'd lose. If Weld couldn't do it Baker certainly can't.
Markey's probably going to retire...and in any event, does Baker really want to run in a Presidential Election in a (atlas) Red state with high turnout among Democrats. That would be suicide for him. If he were to run for Senate...knowing he'd likely lose, he's better off running against Warren in 2022, or in a hypothetical special should Warren be elected President (or Vice-President, or be appointed something like Treasury Secretary).