You got to be kidding me ? unconditional election describes who christ died for. 1 cor 15: 1-4
Christ died for our sins = The elect, the called, Gods people. In acts 18 , when God sent paul to evangelize corinth , it was in order to call out a chosen people.
acts 18:
8And Crispus, the chief ruler of the synagogue, believed on the Lord with all his house; and many of the Corinthians hearing believed, and were baptized.
9Then spake the Lord to Paul in the night by a vision, Be not afraid, but speak, and hold not thy peace: 10For I am with thee, and no man shall set on thee to hurt thee: for I have much people( election of grace} in this city.
So paul obviously preached in his gospel to the corithians that christ died for our sins as the election of grace.
In acts 20 paul says that he preached the gospel of the Grace of God vs
24But none of these things move me, neither count I my life dear unto myself, so that I might finish my course with joy, and the ministry, which I have received of the Lord Jesus, to testify the gospel of the grace of God.
The gospel of the grace of God has as its theme, election of grace:
rom 11: 5Even so then at this present time also there is a remnant according to the election of grace.
So to deny that paul preached in his gospel unconditional election is to deny scripture and deny that paul preached sovereign discriminate grace in the gospel..