The power couple and first family of the apocalypse. They really do belong to each other, I reckon at least.
For one thing, Maggie shares close resemblance to a certain character from the comics. I will spoiler tag that bit:
The one thing I noticed this pairing was in The Killer Within. Maggie had personally delivered Lori's baby and had to help both the baby and Carl reach the group off-screen. The one thing she did after reuniting with the group was to approach Rick to tell him the news. Not Glenn, not Hershel and certainly not the two bit lush! It was Rick, and their reactions were devastating. After Rick had collapsed and giving Judith to Hershel, Maggie didn't care about what she had just gone through. She jumped on the bike with Daryl to get some formula for the baby she had just delivered. That takes guts, and shows us that she supports Rick and his family.
When this pairing started to really work it's way to the top for me is when after Daryl gets captured by the Governor alongside Merle, it is Rick and Maggie that come back to save them. Glenn was heavily injured at the time, and Michonne was still a threat. And the pair of them worked well as a team together. They had quickly stormed in, and in a matter is seconds were able to take down some of the Governor's men and rescue Dixon Bros. Now Maggie didn't trust Merle because of what he had done, but she trusted Rick and his leadership, and she loved him and Daryl like family at this point, She would do anything for them.
And then, when Rick was starting to spook out and see ghost!Lori for the first time, he started to rant and rave. Notice in the background, Maggie quickly reaches for Carl. Not Beth or Hershel, Carl. It's because ever since Lori she feels extremely determined to protect the Grimes family, and she does ask Rick if he is ok. An episode later, she uses Judith as a distraction and cure to get away from the events she has just suffered from. When the prison attacks, she locks Judith in a cell for protection and sets out to protect her home.
Sadly there are not any Rick/Maggie moments in the rest of season3, but they finally interact in season4. When the illness breaks out after Patrick dies, Rick sends Carl off to Maggie's tower, because he knows Maggie will keep him safe. Both she and Carl manage to save Michonne from near death, and despite her family being in danger, Maggie helps Michonne slowly move up to the main area of the prison along with Carl, because they are her friends and they mean a lot to both her and Rick.
The obvious one would be Internment. They had such sizzling chemistry it put them to shame. They worked hard as a team and were the only ones running the prison. Maggie 100% supported Rick's decision to banish Carol, whilst Hershel was unsure and Daryl went off the handle. If it hadn't been for Maggie, Rick would have been dragged out by the herd. When the gunshot first fired, Rick sent off Maggie because he knew her loyalty and determination to protect her family was fierce. He understood how she worked, and vice versa.
As for Glenn/Maggie, they simply don't work for me anymore. The writers have backed them into a corner and keep writing the same material for them over and over again. Have you not noticed that outside scenes of Glenn, Maggie gets to really shine and shows her potential. That is why I feel Glenn should die this season,
Sure, a Rick/Maggie relationship will have problems. The age gap, she's 23/24 and he's 37/38. Not that big a difference later on, but it is for the now. They will face their obstacles and they will overcome them. Maybe it won't even work and it dies down? That is why I support such a ship.