I have never even seen that email but I snoped "social security" and this is the first one that came up, sounds like what you are talking about:
Q: Which party took Social Security from an independent fund and put it
in the general fund so that Congress could spend it?
A: It was Lyndon Johnson and the Democratic-controlled House and Senate.
Q: Which party put a tax on Social Security?
A: The Democratic party.
Q: Which party increased the tax on Social Security?
A: The Democratic Party with Al Gore casting the deciding vote.
Q. Which party decided to give money to immigrants?
A: That's right, immigrants moved into this country at 65 and got SSI Social Security. The Democratic Party gave that to them although they never paid a dime into it.
Then, after doing all this, the Democrats turn around and tell you the Republicans want to take your Social Security.
And the worst part about it is, people believe it!
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Q: Which party took Social Security from an independent fund and put it
in the general fund so that Congress could spend it?
A: It was Lyndon Johnson and the Democratic-controlled House and Senate.
FALSE
These articles should help to clear up the misconceptions.
much more in the link
http://www.snopes.com/cgi-bin/news/ultimatebb.cgi?ubb=get_topic;f=3;t=000003