It baffles me what relevance these sorts of polls have to anything, other than ridiculous appeals to popularity.
Who cares what the general public sees in their crystal balls? The average American has no understanding of what the debt ceiling is, let alone what the possible consequences are of no raising it. Popular opinion is worse than worthless in situations like this.
I agree that most Americans have no clue how our economy works or what the implications of allowing the deadline to pass are.
But there are two things that do matter when it comes to this topic about a poll. One is amusing, the other is not.
The amusing part is how someone started a topic about a poll which clearly indicates the majority of Americans feel allowing the deadline to pass is a bad thing and decided to claim that "Americans aren't worried" in the topic title based on a minority view!
It does not get much more retarded than that.
The second part is that perception is reality. Polls indicate how voters will vote. If they think your party is a bag of dildos, that does not bode well for your party in the next election.
It's relevant to policy wonks and Party officials, for the reasons you've mentioned.
Not so much to arguments for or against raising the debt ceiling.