Because not only did he make a very un-Reaganlike mistake of flubbing a famous movie quote, but also his flub was a little too close to exploding the whole illusion. I mean, "Take one for the Gipper"? Take? There's a big difference between inspiring people to achieve something on their own and just reaching out and taking it, and as much as Obama embodies that difference from Reagan, it'd be good if he didn't remind people about it. That just makes our job harder.
Plus it doesn't help this being the one hundredth anniversary of Reagan's birth. All those snippets folks are getting from talk radio and bloggers of "get government back to within its means" and "lighten our punitive tax burden" and "this last and greatest bastion of freedom" and ugh, that "special interest group that has been too long neglected" and "knows no sectional boundaries, or ethnic and racial divisions," blah blah blah that is "We the People" -- well, realistically, sometimes the contrasts are just too much for us to overcome. But it's our job.
So yes, I know that "Take one for the Gipper" stuff was not helpful at all. People are surprisingly still upset about the Obama administration taking things from them. Usually they've forgotten about political stuff after a while. I mean, Lady Gaga rode an egg to the Grammys and people still want Obamacare repealed? I don't get it.
But that's the situation facing us in 2011. Thank goodness, at least, Obama didn't say "Bend over and take one for the Gipper"! On top of everything else, folks don't need reminding how incensed they are about the TSA, too.