Groundhog Hour

This is something that we've been dealing with for a while, but it is REALLY starting to get to us!  I feel like we have the same 20 conversations over and over with Harrison, and nothing ever changes.  I'm starting to feel like its a toddler version of groundhog day but instead of waking up to the same day each morning, the conversation repeats itself each hour.  Here is an example:

Harrison:  Can I watch tv when we get home?
Me:  No, but you can watch some after nap time if you take a good nap.
Harrison:  Can I watch tv please?
Me:  Harrison, what did I just say to you?
Harrison:  Can I watch tv please?
Me:  The answer is No, don't ask me again.
Harrison:  (Now in a VERY whiny voice) Can I watch tv???I just want to watch tv??Only for 5 minutes??I WANT TO WATCH TV!!!
Me:  You may eat your strawberries first and then it is straight to nap time.
Harrison:  Can I watch tv while I eat strawberries?
Me:  No, get it through your head that you may only watch tv after your nap time, IF you take a good nap.
Harrison:  BUT, I WANT TO WATCH TV BEFORE (crying hysterically by now)
Me:  (silence - because I'm counting in my head how long until it is 5 o'clock and I can have a glass of wine.)
Harrison:  (I've tuned him out by this point but it involves lots of whining and crying and the word tv.)
Me:  ok, I've had enough.  you need to learn that No, means No!  and he went kicking and screaming to bed.

We repeat this style of conversation several times a day.  It isn't always about tv.  Just this afternoon, we were trying to get into the car to go to the pool and he refused to climb in his car seat through his car door and instead wanted to climb in through the trunk door.  I provided a very reasonable explanation that the double stroller and pool toys were blocking the way and that he needed to climb in the car the normal way.  And, thus started the above cited style of conversation with me saying lots of Nos, and him whining, screaming, and pleading.

I'm at my wits end with this behavior!!  Is there an age where kids will miraculously started saying "ok, I see your point."  Or, even, "darn it mom, I really wanted to see that show but I won't throw a fit about it."  I think I may actually faint if I ever hear those words come out of his mouth.  I refuse to give in just to avoid a scene.  We did that enough when he was much younger but now he's at the age where he should be learning that his actions have consequences and that we won't change our mind if he asks us something 122 times in a row.

whew, any advice on how to handle this stage??