How to use find algorithm with a vector of pointers to objects in c++?

I want to find in a vector of Object pointers for a matching object. Here's a sample code to illustrate my problem:

class A {
public:
    A(string a):_a(a) {}
    bool operator==(const A& p) {
        return p._a == _a; 
    }

private: 
    string _a;
};

vector<A*> va;

va.push_back(new A("one"));
va.push_back(new A("two"));
va.push_back(new A("three"));

find(va.begin(), va.end(), new A("two"));

I want to find the second item pushed into the vector. But since vector is defined as a pointers collection, C++ does not use my overloaded operator, but uses implicit pointer comparison. What is the preferred C++-way of solutiono in this situation?