Is Loyalty mising?

What ever happened to loyalty. I was always taught if you commit to do something you do not have a change of heart in the middle and go in the opposite direction. Yet this seems to be a everyday occurrence today. Why it is even OK for our elected officials. Those who were elected to office by people of one party and then change in the middle because "it looked greener on the other side of the fence". I feel bad for the republicans in the state of Pennsylvania who elected Senator Arlen Specter to office. Now he has decided to "turn tails" and run to the other side. Yet just a couple of months ago he said he was a dedicated Republican. Obviously no one can be trusted to tell the truth anymore. Just what was offered to him by the Democratic party? We all know that their goal was to have the 60 votes in the Senate. They could not get it honestly so they steal it at the expense of all Americans. This really sets a good example for all young people in America to follow.