Just to be clear, what Maximus said is inaccurate at every level. As has been noted time and time again, the number of people calling themselves "pro-choice" or "pro-life" changes every year but is essentially at 50/50.
However - and this is something I had
not previously realised, he is wrong for more important reasons than that. The pro-choice/pro-life question is an abstract one. But when you ask people more concrete questions, you get a very different response. If the question is "Do you support Roe vs Wade" OR "Do you believe abortion should be legal in or
most cases?" (By the way, 'most' there is crucial. Maximus keeps trying to claim that abortion just gets higher support because people believe in the health of mother and rape exceptions; this is clearly untrue here as these polls allow them to say they oppose abortion in "Most" cases but still leave those exceptions)
And the answers we get?
Kaiser Family Foundation - Summer 2012 - Legal in All or Most - 55%
Pew - April 2012 - Legal in All or Most - 54%
Quinnipiac - Feb 2012 - LEgal in All or Most - 55%
Quinnipac - Feb 2012 - Support Roe Vs Wade? 64%
In fact, take a basic look at a graph of the WaPo/Kaiser poll on abortion for the last fifteen years or so;

So actually, the American people's view is even further from Maximus' than he was trying to claim. When it comes to abstractions, neither pro-life nor pro-choice is a consistent majority. But time after time, poll after poll, for as long as it has been polled, a very clear majority of Americans believe that abortion should be legal all or most of the time. (Again, not 'some' - 'most') And what did the 2012 election exit polls find? The same as every single other exit poll for twenty-five years.... that about 58% of Americans believe abortion should be legal most or all of the time.
And by the way, when he tries to claim that the Democratic position is for abortion to be legal
all of the time without exceptions and that's unpopular, it's worth remembering that the Republican platform calls for it to be
illegal most of the time without exceptions, which is consistently even less popular. And that the Democrats are far more tolerant of pro-life and less stringent pro-choice members than the Republicans are of non-doctrinare pro-lifers.