AP College Football Poll 2015: Week 13 Rankings Unveiled for Top 25 Teams

Clemson maintained its No. 1 spot in the Associated Press Top 25 poll with another impressive performance Saturday, but there were significant shake-ups elsewhere in the rankings after a wild Week 12. 

Alabama moved up to the No. 2 spot, while Ohio State and Oklahoma State—who were previously ranked second and fourth, respectively—tumbled.

Here is a look at the AP's latest Top 25 poll with just a couple of weeks remaining in the 2015 regular season:

Also, the following is a rundown of Bleacher Report's view of the college football hierarchy:

Both Clemson and Alabama had easy Saturdays, as they enjoyed blowout victories over inferior opponents. The Tigers sunk Wake Forest, 33-13, behind 343 yards and three touchdowns from quarterback Deshaun Watson, while the Crimson Tide rolled past Charleston Southern, 56-6.

The Buckeyes weren't so fortunate, as they managed a mere 132 yards of total offense in a 17-14 loss to rival Michigan State. The defeat dropped OSU to No. 8 in the polls, while the Spartans moved up to No. 6 and now control their own destiny in the Big Ten East.

Ohio State has struggled offensively all season long, with head coach Urban Meyer waffling between J.T. Barrett and Cardale Jones at quarterback. As ESPN's Mike Greenberg pointed out, Saturday's loss was a manifestation of something that had been building for weeks:

Frustration boiled over following the game when superstar running back Ezekiel Elliott—who had just 12 carries for 33 yards—announced his intent to go pro and blasted the play-calling, per ESPN.com's Austin Ward:

"

Honestly, this is my last game in the Shoe. I mean, there's no chance of me coming back next year. What happened today, it was kind of like a bad, bad dream. Offense had a rough day, and I'm disappointed. I'm disappointed in the play calling, I'm disappointed in the situations we were put in, and I wish it all played out differently.

"

OSU wasn't the only top team to go down, as Oklahoma State also fell and had its undefeated season ruined by Baylor.

The Bears toppled the Cowboys by a score of 45-35 in Stillwater, Oklahoma, which is something they hadn't done in more than 75 years, according to ESPN Stats & Info:

Paul Myerberg of USA Today believes Baylor made a great case for itself against Oklahoma State despite last week's loss to Oklahoma:

While Baylor's win means it still has life with regard to the College Football Playoff, it certainly bolstered Oklahoma as well, who held off TCU, 30-29.

Along with the Sooners and Bears, undefeated Iowa and one-loss Notre Dame received a bump in the polls as well by virtue of wins over Purdue and Boston College, respectively.

Although the AP and College Football Playoff rankings haven't necessarily been in sync thus far, the new AP poll paints an interesting picture and perhaps provides a preview of what the CFP committee will come up with.

Oklahoma, Michigan State and Iowa were all on the outside looking in when it came to last week's poll, but all three of them impressed the Associated Press voters enough to move up.

The 2015 college football season has been a crazy and unpredictable one, and that is highlighted by the fact there are still so many quality teams in the running for a CFP spot.

While the new AP poll favors the likes of Clemson, Alabama, Iowa and Notre Dame to be the four left standing, the chaos 2015 has generated suggests that may change significantly in the coming weeks.

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