I think that number is probabaly an over-estimate, and even still, 80 of 300 does not mean a whole lot especially when everythings taken into account. On the other hand, take the number of religious nutjobs who make sure to be at the polls every election, that makes a difference.
I'm not so sure - there are a lot of Republicans playing poker for sure - it attracts smart risk-taking individuals of higher than median education and income and over the web my feeling is that they outnumber or at least equal the Democrats.
As the religious nut Republicans wouldn't be playing (as it's so sinful) that means most of them are going to be on the LIbertarian/Small Government wing. I can't imagine that they are very impressed by this at all and even if they are only, say 20m in number, it's not like the GOP can afford to lose any more votes after the Foley thing blew up at the same time.