Marco Rubio couldn't make inroads because he represented voters that establishment Republicans want, not the ones they have.
The Senate blocked a bill Wednesday that would overrode state laws requiring mandatory labels for food products containing genetically modified organisms.
President Obama wants the Senate to focus on the merits of Merrick Garland, the well-regarded chief judge of the D.C. Circuit Court of Appeals. Republicans want to focus on having the next president choose the nominee.
Do the math, and it remains quite possible that Trump could continue to march along, yet fall short of the 1,237 delegates needed to win the nomination outright.
If Trump wins both Ohio and Florida, he seems assured a path to the nomination. But he's not the favorite in Ohio.