Dems are better politicians. They play the game better and have been since at LEAST 94.
As far as who play the game better - I totally disagree.
Right now, yes the Democrats are dominant, and owns the game.
But in the mid 90's - it was all about the Republicans. Clinton's outstanding charisma (stuff like that are important in US politics) and decent record prevented the Republicans from trying to go up against him seriously in 96. But Gingrich, Rove, Cheney and other neo-cons dominated US domestic politics.
The Republicans won more and more gubernatorial and senator seats.
USA just got more red in general.
The Democrats were crushed and defeated when Bush entered. His years would put the final touch to the power shift that would make the Democrats an irrelevant party.
Instead the Democrats has revamped their party on some issues, they don't force issues that are sensitive anymore. They want gun control - not ban on guns. But it's not really an issue they press either.
Add to that a president who's killed the national economy, handled foreign relations questionably and started an illegit war he wasn't even able to finish.
Then it's easy to see there's a problem.
But just as the late 90's and early 2000's belonged to the Republicans, these last two years have belonged to the Democrats.
And it may get even worse.
Republicans are the ones who should be guarding Obama with their lives.
When Palme was murdered in Sweden in 86, his party was down in ratings, were heading for a likely loss in the election.
But the following year his party got almost record high votes in the election and won easily.