Control of the presidency under the New Rules Obama has implemented means picking and choosing which laws to enforce, and ignoring provisions of Congressionally-passed legislation that are politically inconvenient for the president – at least when that president is a Democrat and can count on the backing of the Mainstream Media and academic establishment. So getting Hillary elected is a much higher priority than control of Congress, now that Obamacare is an accomplished fact.
Actually, this isn’t quite true. What has really protected Obama against pushback from Congress over his high-handed tactics is the protection afforded by the Democrat Senate.
If Congress is united against him, his options become much slimmer. Same with Hillary.