Rand Paul continues to hold a dominating lead over Trey Grayson in the Republican primary for the Senate from Kentucky. It's 46-28 this month.What's less clear is what's driving Paul's continuing dominance in the race. He does have a big lead with Republicans who think the party's too liberal, voters unhappy with the general direction of the party, and folks who consider themselves members of the 'Tea Party. But he has similarly large advantages among voters who think the party is ideologically 'about right,' folks who are happy with the current direction of the GOP, and Republicans who don't consider themselves members of the 'Tea Party.' So there's something more to Paul's current advantage than the conventional wisdom that he's effectively riding the wave of the 'Tea Party' movement.