ANALYSIS — I have argued repeatedly that while the House is up for grabs — and indeed likely to flip to the Democrats in November — the Senate is not in play. I now believe that it is, so I must revise and extend my remarks.

Only about three weeks ago, I reiterated my view that Democrats didn’t have a path to a net gain of two Senate seats, which they need for a chamber majority. But a flurry of state and national polls conducted over the past few weeks suggest Democratic prospects have improved noticeably, giving the party a difficult but discernible route for control.

Democrats are at least even money to flip two GOP-held Senate seats in November — Arizona and Nevada. Both races are very competitive, but President Donald Trump’s problems, the midterm dynamic and the two states’ fundamentals — Trump lost Nevada and barely carried Arizona — surely give Democrats a narrow but clear advantage in both states.

Months ago, I acknowledged a long-shot Democratic opportunity in Tennessee, largely because of the reputation of their high-quality nominee, former Gov. Phil Bredesen. But I didn’t take Bredesen’s chances against the Republican nominee, Rep. Marsha Blackburn, seriously given the state’s partisan bent and Trump’s strong showing there two years ago.

I’m still skeptical about Bredesen’s prospects, but recent polls show that the race is for real. I can no longer simply dismiss his chances.