You may mean that Feinstein isn't a congresswoman.
The names are confusing.
Congress has 2 houses, the Senate and the House of Representatives.
The people from the Senate are called senators.
The people from the House are called either congressmen or reps.
The only title a senator has is "Senator Smith".
While reps. get two.
Even though a senator is a member of a part of Congress they are not called congressman.
Even though they represent people/states they are not called represntatives.
Just to confuse things even more the word congressman isn't really capitalized unless it has a name after it.
The same with representative and senator, unless of course you are naming 1 of the 2 halves of Congress.
Congress as a whole/branch though is capitalized.
I.e. Congress or congressman or Congresswoman Feinstein.
And everything is capitalized at the start of a sentance.
And of course you may mean something else entirely and this whole post can be ignored.