Holt, in his own words, is no Booker. It's a smart move for the Senate underdog.
Which came first? The underdog candidate who took the race by storm, or the allied groups who swooped in with reinforcements? In Massachusetts, neither.
For some potential candidates, the upper chamber may not be the hottest ticket in town.
Ed Markey vs Gabriel Gomez. Blah.
Cory Booker is still the candidate to beat. But he faces a very different picture than he did last week.
It's not as cut-and-dried as it may seem. Murky special election provisions cloud the picture.
The popular governor's decision means more competition for the GOP nod. But Democrats don't look any closer to springing a general election upset.
Foreign policy spat? Check. Budget fight? Done.
With a little more than five weeks until the election, here's what to keep an eye on.