"Would have" in conditional clauses

I have been taught to use the if I had form in conditional clauses referring to the past:

If the president had asked me, I would have told him the same thing.

As far as I can tell though, the would have construct is sometimes used in conditional clauses as well, so it wouldn't be incorrect to say:

If the president would have asked me, I would have told him the same thing.

What is the difference between the two and the proper use of the latter?

Solution 1:

The first sentence is the right one. The only other correct equivalent that I know for the first one is " Had the President asked me, I would have told him the same thing".

Solution 2:

The second example is wrong - but, sadly, is frequently heard nowadays.

The first example is correct.