The minor detail is that Specter was not a member of Congress in 1974, since he did not start serving until 1981.

In the spirit of bipartisanship, and to help Scottish RINOs everywhere, I comprised a highlight list of other legislation that Specter also did not vote for:
1) Soviet liquidation of kulaks
2) Alien & Sedition Acts
3) Spanish Inquisition
4) Destruction of the Alexandrian Library
5) Execution of Socrates
UPDATE
Golly, after I wasted all that time powerpointing a Scottish RINO, Specter forces me to make a Benedict Arlen picture:

This may be a benefit in disguise. Toomey would probably have won the Republican primary. However, since Pennsylvania has become rather blue as of late, Toomey might well have lost the general election to a generic Democrat. Assuming Specter wins reelection, at least the next PA senator will be a blue dog Democrat/former squishy RINO, which would be better than an out and out Bolshevik. This is assuming that Specter doesn't develop a vendetta against his former GOP colleagues & seek to become the biggest socialist imaginable just out of pure spite.
