Tires or Alignment

Okay, when I bought my Dart, the owner told me it would need new tires. It has 195/75/13's now...no big deal. But when it runs, it wants to move to the left, so it constantly needs steering.

The other day I was looking at the tires, and they are bad...especially in the front. In the front, the metal is showing. So I was wondering, if I replaced the tires, will that help this? I am planning on doing the alignment as well, but I just wanted to see if it would help.

Thanks in advance.

-Jeremiah