The remarkable partisan shift on NSA tracking your telephone calls. Can one explain the increased Democrat support without resorting to the fact that a Democrat is in the White House?

I am not sure if the numbers are directly comparable because the government tracking wasn't nearly as extensive back in 2006, but with a Democrat in the White House Democrats go from opposing tracking by a 61 to 37 percent rate to supporter it by 64 to 34 percent.  Republicans still support it though at a lower rate.  Independents go from opposing it to supporting it.  Given that the tracking is so much more extensive, can one explain the increased Democrat support without resorting to the fact that a Democrat is in the White House?