Avraham Connection

In the hafotrah it says ואתה ישראל עבדי יעקב אשר בחרתיך זרע אברהם אהבי (Yesheyahu 41:8.)  Why are we refered to as the אברהם if we are called already יעקב?  The last Rav Tzaddok on the parsha says we see that even though we are called generally by the name Yaakov or Yisroel, the relationship to Avraham still stands and can be evoked at times.  The Chidushay Harim says that when Hashem promises Avraham אנכי מגן לך it is not just a promise to Avraham but to every single Jew.  There is a נקודה of Avraham, the מגן אברהם that remains within everyone.  The Sifsay Tzaddik says that is what allows even a Jew who may have strayed far to come back for he is connected to Avraham.  What is the nature of this connection and why do we need to come back to the connection specifically to Avraham?  And why do we need to evoke his name sometimes?

The Chassideshe seforim explain that the journey of Avraham was not just a physical journey but a spiritual journey into his soul.  לך לך, go toward yourself, discover the potential within one's self.  Avraham was instructed to find a new path in life.  He had to start from scratch and build a new nation. Avraham is the one to establish the mission statement for the Jews, to be trailblazers and bring spirituality to the world.  It is a process started by Avraham and becomes ironed out and solidified by Yitzchak and finally by Yaakov.  Yaakov is the culmination of the building process; he perfects the mission and therefore merits that all of his children should be included.  That is why we generally refer to ourselves as the children of Yaakov.  However, sometimes one loses track of the mission.  He loses his connection to the message passed down from Yaakov.  How does such a person come back?  He isn't accessing his connection to Yaakov for he is full of imperfections?  He taps into his connection to Avraham.  Avraham is called אוהבי, his love for Hashem was so great.  When one has such love for someone else, the problems can be glossed over.  Even though one is not deserving of being welcomed back, he is accepted because he is connected to Avraham, the great lover of Hashem and hence loved by Hashem as well.  Hashem does not look at the person's blemishes because of the great love He has for the person.  It is in such situations that one must evoke the merit of Avraham.  The haftorah tells us that at least because we are connected to Avraham we will merit salvation.