Sensop: Actually, there is a way to verify it; It's called exit polling; Polsters ask people as they leave the polling place how they voted, and why.
Exit polling from the '94 election, as I recall, indicated that aproximately HALF of the people who voted were gun owners, and some 80% of us voted Republican. This was enough by itself to explain most of the election outcome.
Note, I said "gun owners", not "NRA members". They didn't orchestrate that outcome, they ran like heck to get in front of the mob, and then yelled, "Follow me!", moments before they got run over.
If anything, the NRA actually blunted the outcome of that election, with their fudged candidate ratings; They didn't expect the Republicans to take control, so they were still playing games with the candidate ratings to avoid angering incumbant Democrats they expected to win. I'd guess there might have been as many as a half dozen seats where we could have replaced compromisers with staunch pro-gunners, if they had played it straight with the ratings, and ignored incumbancy when making their endorsements.
For instance, John Dingell, the NRA board member who betrayed us, and cast the deciding vote to pass the "assault weapons" ban, nearly got beat by a pro-gun Republican, despite everything the NRA could do to make excuses for him. If they'd said to the members, "He betrayed us; Rip his throat out!", the Republicans would have had a bigger margin in the House, and might have been able to ignore anti-gun Republicans when chosing their leaders.
And I still seethe when I remember how they spent the money I sent the PVF, running advertisements AGAINST John Coon, the almost fanatically pro-gun Libertarian Senate candidate, instead of using it against somebody anti-gun, such as David Bonior, who almost got beat despite the NRA leaving him pretty much alone. And they did that even knowing from the polls that Abraham, (Who they claimed was pro-gun, but hasn't shown any sign of it since he got elected.) was going to win running away no matter how Coon did! They wasted my money, worse than wasted it, attacking the most pro-gun candidate in the race! Last money they got from me, I'll tell you.
By the way, to show you what a gentleman Coon was, he spent the last of his campaign funds running radio ads urging his NRA supporters to forgive the NRA, and NOT tear up any more membership cards.
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Sic semper tyrannis!