Analysis: The Senate playing field is shrinking

Last week, a super PAC affiliated with Mitch McConnell announced it was pulling nearly $6 million out of the New Hampshire Senate race. On Tuesday, the group dumped an additional $6 million into the Pennsylvania Senate race.

​Last week, a super PAC affiliated with Mitch McConnell announced it was pulling nearly $6 million out of the New Hampshire Senate race. On Tuesday, the group dumped an additional $6 million into the Pennsylvania Senate race.