Lawrence: Trump is getting one thing right. If Republicans lose the midterms, they will blame him.

Tonight on The Last Word: Republicans pour huge amounts of campaign cash into Ohio. Also, Florida Democrats’ voter registration outpaces Republicans in September. Plus, the Donald Trump-Vladimir Putin diesel deal faces growing backlash. And The New York Times reports a Russia oil deal could enrich Trump’s allies. Sherrod Brown, David Jolly, and Eric Lipton join Lawrence O’Donnell.