According to the Mormans and their book John the Baptist was sent from Heaven and conferred the Aaronic Priesthood upon Joseph Smith and Oliver Cowdery. Read the following excerpt taken from http://www.lds.org.
The Aaronic Priesthood continued “with the house of Aaron among the children of Israel” from Aaron until John the Baptist, who was a priest in the Aaronic order (D&C 84:26–27), and by this authority he prepared the way for and baptized Jesus. Nineteen centuries later this same John was sent from heaven as a resurrected being to confer the Aaronic Priesthood upon Joseph Smith and Oliver Cowdery. This was done on May 15, 1829, near Harmony, Pennsylvania, along the banks of the Susquehanna River. At that time John outlined some of the duties, privileges, and limitations of the priesthood, specifying that the Aaronic Priesthood holds the keys of the ministry of angels and can perform baptisms by water, but has not the authority to confer the gift of the Holy Ghost. The Aaronic Priesthood functions under the direction of the Melchizedek Priesthood (D&C 13; JS—H 1:68–72). (taken from www.lds.org)
That is unfortunate seeing that the book of Hebrews, specifically chapter 7, tells us that this priesthood has been replaced (v.11). So the question you have to ask is why would John the Baptist come back to make someone something that no longer had any use. Jesus is the new and permanent High Priest. He replaced the old and being of the Melchisedec order is of an eternal priesthood (Psalm 110:4).
The Aaronic priesthood was inferior in multiple ways. In chapter 7 verse 18 the Bible calls the Aaronic or Levitical priesthood “weak” and “unprofitable.” It made nothing perfect (v.19). In this same chapter the writer of Hebrews shows the inferiority of the Aaronic priesthood by the fact that the Levites paid tithes to Melchisedec by federal representation (7:9,10). Abraham being the head and the Levites stemming from Him are said to have recognized the superiority of Melchisedec. Jesus being a High Priest after the order of Melchisedec would also then be greater than Abraham and the entire Aaronic priesthood.
There is no longer any need for a human priest seeing we have an eternal High Priest. We are no longer distanced from our God. We now come to God through God the Son.
Don’t settle for something less than what God truly offers. Jesus said “I am the way…no man comes to the Father but by me.”(Jn. 14:6) Have you come to God through Jesus Christ or are you trusting some other priesthood or avenue to God? All others fail just as the Aaronic priesthood fails. They are all men who also need forgiveness of their own sins (v. 23,27).