This chart looks great for the Dems... until you look closer
Trump's support dropping to <40% and falling looks encouraging. Clinton's margin over him is a huge relief for those of us who've been worrying about her core politicking skills. But not so flattering is her 7 point drop over the last two months in match ups against Trump.
Trump in the same cycle has shot up in the polls, as he zeroed in on clinching the nomination, and then petered out to the original preference numbers once he started letting his freak flag fly. But in the same news arc, Clinton has slid down steadily until leveling off in the 43-45% range.
She's riding on his core unpopularity. She's winning by virtue of running against a truly reprehensible human being. Right now it looks like the election is hers to lose. A coup in the GOP convention hall could reshuffle the deck. It would, of course, desperately divide the Republicans from the Trump base of chumps. But then they'd have four months to repair the damage. It's an unlikely scenario, but one our side should be ready to deal with.
They can't do worse than Trump; that's certain. Any change will improve their chances. And frankly Clinton's dropping numbers in the same time frame as Trump's implosion may have blinded us to the realities of a weak Democratic nominee in the year when voters desperately want change. Our side needs excitement; our side needs an energy blast to get out of these doldrums. Our side needs Elizabeth Warren.
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torturing Repubs in the Senate. She's good at it. Plus, if we flip the Senate, she'd be a natural for Commerce Committee Chairman. 
2. Mass is the bluest state in the country, Warren is no help there. I say go somewhere else.
3. It is historical truth that Clinton has seldom, if ever, risen higher in the polls than she starts. 
4. To replace Trump now would shatter the Repub party, what's left of it anyway. His base would rebel, and it seems unlikely that any swing voters would jump right after this fiasco, at least not enough to sway the final vote. Right now it looks like Hillary will win with Obama-like numbers, if not more.
However it empties a desperately needed US Senate seat which not too long ago was held by the GOP, just like Warren's.
That worries me.
