How could Jesus get followers so easily? Reading how Jesus called his disciples, I am always perplexed at how they just leave everything and start following him. An example passage:


  Matthew 4:18-22 (ESV)
  &nbsp;18 While walking by the Sea of Galilee, he saw two brothers, Simon (who is called Peter) and Andrew his brother, casting a net into the sea, for they were fishermen. 19And he said to them, "Follow me, and I will make you fishers of men." 20Immediately they left their nets and followed him. 21And going on from there he saw two other brothers, James the son of Zebedee and John his brother, in the boat with Zebedee their father, mending their nets, and he called them. 22Immediately they left the boat and their father and followed him.   


It's really amazing that anyone in their right minds would act like that. Now, one might think that Jesus does some miracles that just aren't mentioned. However, his first sign was at Cana and he already had disciples at that time.


  John 2:11 (ESV)
   11This, the first of his signs, Jesus did at Cana in Galilee, and manifested his glory. And his disciples believed in him.   


Why were the disciples so eager to start following Jesus?
Luke 5 (CEV) tells a little more of the story:

One day Jesus was standing beside Lake Gennesaret (Galilee) when the crowd pressed in around him to hear God’s word. Jesus saw two boats sitting by the lake. The fishermen had gone ashore and were washing their nets. Jesus boarded one of the boats, the one that belonged to Simon, then asked him to row out a little distance from the shore. Jesus sat down and taught the crowds from the boat. When he finished speaking to the crowds, he said to Simon, “Row out farther, into the deep water, and drop your nets for a catch.”
Simon replied, “Master, we’ve worked hard all night and caught nothing. But because you say so, I’ll drop the nets.”
So they dropped the nets and their catch was so huge that their nets were splitting. They signaled for their partners in the other boat to come and help them. They filled both boats so full that they were about to sink. When Simon Peter saw the catch, he fell at Jesus’ knees and said, “Leave me, Lord, for I’m a sinner!” Peter and those with him were overcome with amazement because of the number of fish they caught. James and John, Zebedee’s sons, were Simon’s partners and they were amazed too.
Jesus said to Simon, “Don’t be afraid. From now on, you will be fishing for people.” As soon as they brought the boats to the shore, they left everything and followed Jesus.

So, there was a miracle.
(One explanation for the apparent contradiction with John is that the disciples encountered Jesus on more than one occasion. At the wedding the disciples believed, and at the lake they started to follow)