Na, it's not the Republicans who refuse to talk about it. Both parties refuse to confront it when they are in power, and blame the other party when they are out of power.
Bush actually has tried to do something about social security, usually called the third rail of politics, but he has been unable to get anywhere with it, because neither party really wants to take the unpleasant actions needed to fix the problem. Better to postpone it for someone else to solve--unfortunately making it even worse.
Moments ago, Dem Bill Pascrell from NJ brought up this story on Fox and said it proved the Bush economy was tanking. If only, just once, we could run this party as a true team effort, without someone making stupid observations to the media. Someone show Walker to the door...
Democrats love to talk about it as an excuse to raise taxes. Works on a lot of otherwise conservative folks too.