>> let's move on to something else all three candidates spent a lot of time on last night, isis and fighting terror. take a look at this cnn poll. registered voters say the top issue is the economy. clinton said she wouldn't raise taxes on midhfl class families making under $200,000, but sanders would raise taxes to pay for free college tuition and health care programs, so who stands to win on this issue, peter? >> well, it's been pretty much a norm within the mainstream democratic party, you don't call for raising taxes on the middle class. that actually limits how ambitious you can be in terms of new social programs. it's worth noting the most important social programs we have do rely on taxes in the middle clas, some kind of big new program for child care would require the same, but politically that's considered too dangerous for democrats so they focused their taxes only on