Two quick thoughts on this. First, I'm a little surprised by these results. Not only have conservative Republicans been dominating the discourse, but the critics' talking points have been largely internalized by journalists covering the debate. There's at least some data suggesting Americans actually want less stimulus in the stimulus bill. It's at least possible, then, that the Gallup results are an outlier. (It's also possible that the numbers are connected to Obama's personal popularity -- Rasmussen doesn't include the president's name in its stimulus polling, while Gallup did.)
Second, Gallup noted "the degree to which Obama appears to be maintaining the upper hand over his opponents." If only that were true. Given what we've seen of late, there's no reason to believe Republicans' conduct is in any way connected to the demands of voters. The president would have the upper hand if the minority party were swayed by public opinion, but at least for now, the GOP is more interested in standing on the party's "core principles" than anything else.
From Truth Dig:
...watching TV news may actually shrink your brain. Well, that's not fair, but it certainly won't teach you much about stimulating the economy. That's because the personalities that populate the airwaves—and not just Fox News—are given license to repeat untruths over and over again.