I say you're mystery insect is a species of Stonefly larvae.
Could be Shawn, if you look at the bottom right hand corner of the very first picture you will see a second mystery insect that is the exactly the same but just 1/3 the size of the bigger stonefly larvae. In addition if look closely in the second picture just above one end of the blood worm you can see where the smaller mystery insect may have shed it's exo-skeleton while it was in the jar.
You must have excellent water quality!!
And here I thought it was because of the all the coontail we have everywhere.
