Are there any good possible senate candidates in MA able to take Warren's spot if she does get tapped for VP?
Absolutely. MA's bench is absurdly deep. There is a good mix of elder statesmen and rising stars. Out of the fourteen people listed on the '14 young democrats to watch' list, four are from MA.
http://www.nytimes.com/interactive/...crats-to-watch.html?ref=opinion&smid=tw-share
Deval Patrick - Should need no explanation
Barney Frank - He'd probably only serve a term or two to keep the seat warm for someone younger
Joe Kennedy III - Very young, but he's apparently well-respected in the House already.
Niki Tsongas - widow of Paul Tsongas and a well-respected US rep in her own right. I think in prior Senate elections there was a big effort to try to get her to run
Seth Moulton - I hadn't heard of him until he was on the list above, but it sounds like he's made a name for himself since I left the state in 2013.
Mike Capuano - ran too early in 2010, and lost to Martha Coakley in the primary who had more name recognition. But he's another well-respected rep. He doesn't have as big of a statewide profile as some of the others, but enough that he could do well
Ayanna Pressley - rising star in Boston, she's been an at large councilor for seven years now and the time is ripe for her to make a move up. She has to look outside Boston because I think Marty Walsh is in it for the long haul.
Michelle Wu - Didn't hear about her until that NYT article either. She actually might be too young now, but one of the above folks leaving the House for the Senate could open up a seat for her to improve in the future.
If we're trying to groom future Presidents
getting Ayanna to jump to the Senate now at 42 is probably the best thing to do. Kennedy, being only 35, can probably wait until Ed Markey retires after another term or two. Moulton in third
If we're trying to have an elder statesman who would probably win and do good work but only stay in office for a term or two:
Frank or Tsongas
If we want another Ted Kennedy to be a big liberal presence in the Senate:
Mike Capuano or Deval Patrick