It seems to be about evenly split in the US and someone just posted numbers for Germany - in the US it was about 45% of those polled support the program, 45% oppose, and 10% just really don't want to think about it thanks. Of course, it's hard to tell how accurate that is - many of those who support the program are doing so solely because Obama is in the whitehouse - many of those who oppose are doing so for the same reason (seems to be about 20-30% in either case). I know the numbers are somewhere around there anyway - you'd have to look up the exact values.
Regardless, the shape and nature of the US has always been determined by minorities of the population. The vast majority of people simply don't care, and will go with whatever means they can let someone else worry about it. The vast majority of the population doesn't know the sort of thing the US government has gotten up to over the years - The MK Ultras and Latin American Coups, the infiltration, subversion, and breakup of peaceful opposed political organizations, the money spent on corporate capture or the violence done to those who fight the status quo, or the not-exactly-hidden extent of the corporate capture many sections of government have experienced. When things change, they change because a minority of the population either manages to bend the system to serve their interests, or convinces a large enough section of the population that an issue is worth caring about.
So around half the population don't care about this sort of thing - but they should, in my opinion.