And, as of today I think you are right, but it is early, the conventions haven't occurred and a lot can happen before November, good or bad.
But, keeping the White House without making gains in the House (majority) and Senate (super majority) the results may be the same, gridlock. The mandate you are hoping for would only come with a complete sweep.
I am not following the primaries extremely close, but I think some of the open seats and a few contested seats held by the few moderate Republicans left are going to Teabaggers. This may be good or bad. Good if it give the edge to the Dems, bad if it increases the Tea Party in Congress.