Dishwasher not draining completely

If you take the toe panels off and look at the motor you will see the discharge anti-siphon tube there with the drain hose attached. That tube is the discharge major restriction point. Be careful not to destroy the anti-siphon valve, by pulling the bale, remove it, a flapper valve. If you can't see through the tube you have found the problem. Punch a screwdriver into it to dislodge the crap and clean it up. Put the anti-siphon valve back in as found and check it out. Be careful, when you remove the tube , water will come out of the pump assembly. If you remove the hose be sure to watch for water there also.

I hope this helps..
http://www.partselect.com/dishwasher+water-wont-drain+repair.htm
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I was having the same problem with water sitting at the bottom of my dish washer. I had recently installed a new garbage disposal when the problem started. You need to make sure that you knock out the inlet valve where the disposal drain line hooks up. If you have never hooked up a washer to your disposal, this piece will be in place. Stick a flat head screwdriver in where the drain hooks up and hit it with a hammer and the small plastic circle will pop out. The washer does not use any water when that is blocked and therefore will leave the old water to turn rancid...I hope this helps!

i tried all the other stuff then took the hose off of the pump there was a piece of plastic from a wheel that had broken over a year before jamming the pump it was not that hard to do

Our Frigidaire has not been draining completely. After I fussed around looking for answers, my wife read the manual and fixed it. She completely cleaned the inside out and the vent on the sink was really dirty and plugged. Now it works fine.